smartmta/dist_ts/mail/routing/classes.unified.email.server.js

import * as plugins from '../../plugins.js';
import * as paths from '../../paths.js';
import { EventEmitter } from 'events';
import { logger } from '../../logger.js';
import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../../security/index.js';
import { DKIMCreator } from '../security/classes.dkimcreator.js';
import { IPReputationChecker } from '../../security/classes.ipreputationchecker.js';
import { RustSecurityBridge } from '../../security/classes.rustsecuritybridge.js';
import { EmailRouter } from './classes.email.router.js';
import { Email } from '../core/classes.email.js';
import { DomainRegistry } from './classes.domain.registry.js';
import { DnsManager } from './classes.dns.manager.js';
import { BounceManager, BounceType, BounceCategory } from '../core/classes.bouncemanager.js';
import { createSmtpServer } from '../delivery/smtpserver/index.js';
import { createPooledSmtpClient } from '../delivery/smtpclient/create-client.js';
import { MultiModeDeliverySystem } from '../delivery/classes.delivery.system.js';
import { UnifiedDeliveryQueue } from '../delivery/classes.delivery.queue.js';
import { UnifiedRateLimiter } from '../delivery/classes.unified.rate.limiter.js';
import { SmtpState } from '../delivery/interfaces.js';
/**
 * Unified email server that handles all email traffic with pattern-based routing
 */
export class UnifiedEmailServer extends EventEmitter {
    dcRouter;
    options;
    emailRouter;
    domainRegistry;
    servers = [];
    stats;
    // Add components needed for sending and securing emails
    dkimCreator;
    rustBridge;
    ipReputationChecker;
    bounceManager;
    ipWarmupManager;
    senderReputationMonitor;
    deliveryQueue;
    deliverySystem;
    rateLimiter; // TODO: Implement rate limiting in SMTP server handlers
    dkimKeys = new Map(); // domain -> private key
    smtpClients = new Map(); // host:port -> client
    constructor(dcRouter, options) {
        super();
        this.dcRouter = dcRouter;
        // Set default options
        this.options = {
            ...options,
            banner: options.banner || `${options.hostname} ESMTP UnifiedEmailServer`,
            maxMessageSize: options.maxMessageSize || 10 * 1024 * 1024, // 10MB
            maxClients: options.maxClients || 100,
            maxConnections: options.maxConnections || 1000,
            connectionTimeout: options.connectionTimeout || 60000, // 1 minute
            socketTimeout: options.socketTimeout || 60000 // 1 minute
        };
        // Initialize Rust security bridge (singleton)
        this.rustBridge = RustSecurityBridge.getInstance();
        // Initialize DKIM creator with storage manager
        this.dkimCreator = new DKIMCreator(paths.keysDir, dcRouter.storageManager);
        // Initialize IP reputation checker with storage manager
        this.ipReputationChecker = IPReputationChecker.getInstance({
            enableLocalCache: true,
            enableDNSBL: true,
            enableIPInfo: true
        }, dcRouter.storageManager);
        // Initialize bounce manager with storage manager
        this.bounceManager = new BounceManager({
            maxCacheSize: 10000,
            cacheTTL: 30 * 24 * 60 * 60 * 1000, // 30 days
            storageManager: dcRouter.storageManager
        });
        // IP warmup manager and sender reputation monitor are optional
        // They will be initialized when the deliverability module is available
        this.ipWarmupManager = null;
        this.senderReputationMonitor = null;
        // Initialize domain registry
        this.domainRegistry = new DomainRegistry(options.domains, options.defaults);
        // Initialize email router with routes and storage manager
        this.emailRouter = new EmailRouter(options.routes || [], {
            storageManager: dcRouter.storageManager,
            persistChanges: true
        });
        // Initialize rate limiter
        this.rateLimiter = new UnifiedRateLimiter(options.rateLimits || {
            global: {
                maxConnectionsPerIP: 10,
                maxMessagesPerMinute: 100,
                maxRecipientsPerMessage: 50,
                maxErrorsPerIP: 10,
                maxAuthFailuresPerIP: 5,
                blockDuration: 300000 // 5 minutes
            }
        });
        // Initialize delivery components
        const queueOptions = {
            storageType: 'memory', // Default to memory storage
            maxRetries: 3,
            baseRetryDelay: 300000, // 5 minutes
            maxRetryDelay: 3600000 // 1 hour
        };
        this.deliveryQueue = new UnifiedDeliveryQueue(queueOptions);
        const deliveryOptions = {
            globalRateLimit: 100, // Default to 100 emails per minute
            concurrentDeliveries: 10,
            processBounces: true,
            bounceHandler: {
                processSmtpFailure: this.processSmtpFailure.bind(this)
            },
            onDeliverySuccess: async (item, _result) => {
                // Record delivery success event for reputation monitoring
                const email = item.processingResult;
                const senderDomain = email.from.split('@')[1];
                if (senderDomain) {
                    this.recordReputationEvent(senderDomain, {
                        type: 'delivered',
                        count: email.to.length
                    });
                }
            }
        };
        this.deliverySystem = new MultiModeDeliverySystem(this.deliveryQueue, deliveryOptions, this);
        // Initialize statistics
        this.stats = {
            startTime: new Date(),
            connections: {
                current: 0,
                total: 0
            },
            messages: {
                processed: 0,
                delivered: 0,
                failed: 0
            },
            processingTime: {
                avg: 0,
                max: 0,
                min: 0
            }
        };
        // We'll create the SMTP servers during the start() method
    }
    /**
     * Get or create an SMTP client for the given host and port
     * Uses connection pooling for efficiency
     */
    getSmtpClient(host, port = 25) {
        const clientKey = `${host}:${port}`;
        // Check if we already have a client for this destination
        let client = this.smtpClients.get(clientKey);
        if (!client) {
            // Create a new pooled SMTP client
            client = createPooledSmtpClient({
                host,
                port,
                secure: port === 465,
                connectionTimeout: this.options.outbound?.connectionTimeout || 30000,
                socketTimeout: this.options.outbound?.socketTimeout || 120000,
                maxConnections: this.options.outbound?.maxConnections || 10,
                maxMessages: 1000, // Messages per connection before reconnect
                pool: true,
                debug: false
            });
            this.smtpClients.set(clientKey, client);
            logger.log('info', `Created new SMTP client pool for ${clientKey}`);
        }
        return client;
    }
    /**
     * Start the unified email server
     */
    async start() {
        logger.log('info', `Starting UnifiedEmailServer on ports: ${this.options.ports.join(', ')}`);
        try {
            // Initialize the delivery queue
            await this.deliveryQueue.initialize();
            logger.log('info', 'Email delivery queue initialized');
            // Start the delivery system
            await this.deliverySystem.start();
            logger.log('info', 'Email delivery system started');
            // Start Rust security bridge — required for all security operations
            const bridgeOk = await this.rustBridge.start();
            if (!bridgeOk) {
                throw new Error('Rust security bridge failed to start. The mailer-bin binary is required. Run "pnpm build" to compile it.');
            }
            logger.log('info', 'Rust security bridge started — Rust is the primary security backend');
            // Set up DKIM for all domains
            await this.setupDkimForDomains();
            logger.log('info', 'DKIM configuration completed for all domains');
            // Create DNS manager and ensure all DNS records are created
            const dnsManager = new DnsManager(this.dcRouter);
            await dnsManager.ensureDnsRecords(this.domainRegistry.getAllConfigs(), this.dkimCreator);
            logger.log('info', 'DNS records ensured for all configured domains');
            // Apply per-domain rate limits
            this.applyDomainRateLimits();
            logger.log('info', 'Per-domain rate limits configured');
            // Check and rotate DKIM keys if needed
            await this.checkAndRotateDkimKeys();
            logger.log('info', 'DKIM key rotation check completed');
            // Skip server creation in socket-handler mode
            if (this.options.useSocketHandler) {
                logger.log('info', 'UnifiedEmailServer started in socket-handler mode (no port listening)');
                this.emit('started');
                return;
            }
            // Ensure we have the necessary TLS options
            const hasTlsConfig = this.options.tls?.keyPath && this.options.tls?.certPath;
            // Prepare the certificate and key if available
            let key;
            let cert;
            if (hasTlsConfig) {
                try {
                    key = plugins.fs.readFileSync(this.options.tls.keyPath, 'utf8');
                    cert = plugins.fs.readFileSync(this.options.tls.certPath, 'utf8');
                    logger.log('info', 'TLS certificates loaded successfully');
                }
                catch (error) {
                    logger.log('warn', `Failed to load TLS certificates: ${error.message}`);
                }
            }
            // Create a SMTP server for each port
            for (const port of this.options.ports) {
                // Create a reference object to hold the MTA service during setup
                const mtaRef = {
                    config: {
                        smtp: {
                            hostname: this.options.hostname
                        },
                        security: {
                            checkIPReputation: false,
                            verifyDkim: true,
                            verifySpf: true,
                            verifyDmarc: true
                        }
                    },
                    // Security verification delegated to the Rust bridge
                    dkimVerifier: {
                        verify: async (rawMessage) => {
                            try {
                                const results = await this.rustBridge.verifyDkim(rawMessage);
                                const first = results[0];
                                return { isValid: first?.is_valid ?? false, domain: first?.domain ?? '' };
                            }
                            catch (err) {
                                logger.log('warn', `Rust DKIM verification failed: ${err.message}`);
                                return { isValid: false, domain: '' };
                            }
                        }
                    },
                    spfVerifier: {
                        verifyAndApply: async (session) => {
                            if (!session?.remoteAddress || session.remoteAddress === '127.0.0.1') {
                                return true; // localhost — skip SPF
                            }
                            try {
                                const result = await this.rustBridge.checkSpf({
                                    ip: session.remoteAddress,
                                    heloDomain: session.clientHostname || '',
                                    hostname: this.options.hostname,
                                    mailFrom: session.envelope?.mailFrom?.address || session.mailFrom || '',
                                });
                                return result.result === 'pass' || result.result === 'none' || result.result === 'neutral';
                            }
                            catch (err) {
                                logger.log('warn', `Rust SPF check failed: ${err.message}`);
                                return true; // Accept on error to avoid blocking mail
                            }
                        }
                    },
                    dmarcVerifier: {
                        verify: async () => ({}),
                        applyPolicy: () => true
                    },
                    processIncomingEmail: async (email) => {
                        // Process email using the new route-based system
                        await this.processEmailByMode(email, {
                            id: 'session-' + Math.random().toString(36).substring(2),
                            state: SmtpState.FINISHED,
                            mailFrom: email.from,
                            rcptTo: email.to,
                            emailData: email.toRFC822String(), // Use the proper method to get the full email content
                            useTLS: false,
                            connectionEnded: true,
                            remoteAddress: '127.0.0.1',
                            clientHostname: '',
                            secure: false,
                            authenticated: false,
                            envelope: {
                                mailFrom: { address: email.from, args: {} },
                                rcptTo: email.to.map(recipient => ({ address: recipient, args: {} }))
                            }
                        });
                        return true;
                    }
                };
                // Create server options
                const serverOptions = {
                    port,
                    hostname: this.options.hostname,
                    key,
                    cert
                };
                // Create and start the SMTP server
                const smtpServer = createSmtpServer(mtaRef, serverOptions);
                this.servers.push(smtpServer);
                // Start the server
                await new Promise((resolve, reject) => {
                    try {
                        // Leave this empty for now, smtpServer.start() is handled by the SMTPServer class internally
                        // The server is started when it's created
                        logger.log('info', `UnifiedEmailServer listening on port ${port}`);
                        // Event handlers are managed internally by the SmtpServer class
                        // No need to access the private server property
                        resolve();
                    }
                    catch (err) {
                        if (err.code === 'EADDRINUSE') {
                            logger.log('error', `Port ${port} is already in use`);
                            reject(new Error(`Port ${port} is already in use`));
                        }
                        else {
                            logger.log('error', `Error starting server on port ${port}: ${err.message}`);
                            reject(err);
                        }
                    }
                });
            }
            logger.log('info', 'UnifiedEmailServer started successfully');
            this.emit('started');
        }
        catch (error) {
            logger.log('error', `Failed to start UnifiedEmailServer: ${error.message}`);
            throw error;
        }
    }
    /**
     * Handle a socket from smartproxy in socket-handler mode
     * @param socket The socket to handle
     * @param port The port this connection is for (25, 587, 465)
     */
    async handleSocket(socket, port) {
        if (!this.options.useSocketHandler) {
            logger.log('error', 'handleSocket called but useSocketHandler is not enabled');
            socket.destroy();
            return;
        }
        logger.log('info', `Handling socket for port ${port}`);
        // Create a temporary SMTP server instance for this connection
        // We need a full server instance because the SMTP protocol handler needs all components
        const smtpServerOptions = {
            port,
            hostname: this.options.hostname,
            key: this.options.tls?.keyPath ? plugins.fs.readFileSync(this.options.tls.keyPath, 'utf8') : undefined,
            cert: this.options.tls?.certPath ? plugins.fs.readFileSync(this.options.tls.certPath, 'utf8') : undefined
        };
        // Create the SMTP server instance
        const smtpServer = createSmtpServer(this, smtpServerOptions);
        // Get the connection manager from the server
        const connectionManager = smtpServer.connectionManager;
        if (!connectionManager) {
            logger.log('error', 'Could not get connection manager from SMTP server');
            socket.destroy();
            return;
        }
        // Determine if this is a secure connection
        // Port 465 uses implicit TLS, so the socket is already secure
        const isSecure = port === 465 || socket instanceof plugins.tls.TLSSocket;
        // Pass the socket to the connection manager
        try {
            await connectionManager.handleConnection(socket, isSecure);
        }
        catch (error) {
            logger.log('error', `Error handling socket connection: ${error.message}`);
            socket.destroy();
        }
    }
    /**
     * Stop the unified email server
     */
    async stop() {
        logger.log('info', 'Stopping UnifiedEmailServer');
        try {
            // Clear the servers array - servers will be garbage collected
            this.servers = [];
            // Stop Rust security bridge
            await this.rustBridge.stop();
            // Stop the delivery system
            if (this.deliverySystem) {
                await this.deliverySystem.stop();
                logger.log('info', 'Email delivery system stopped');
            }
            // Shut down the delivery queue
            if (this.deliveryQueue) {
                await this.deliveryQueue.shutdown();
                logger.log('info', 'Email delivery queue shut down');
            }
            // Close all SMTP client connections
            for (const [clientKey, client] of this.smtpClients) {
                try {
                    await client.close();
                    logger.log('info', `Closed SMTP client pool for ${clientKey}`);
                }
                catch (error) {
                    logger.log('warn', `Error closing SMTP client for ${clientKey}: ${error.message}`);
                }
            }
            this.smtpClients.clear();
            logger.log('info', 'UnifiedEmailServer stopped successfully');
            this.emit('stopped');
        }
        catch (error) {
            logger.log('error', `Error stopping UnifiedEmailServer: ${error.message}`);
            throw error;
        }
    }
    /**
     * Verify inbound email security (DKIM/SPF/DMARC) using the Rust bridge.
     * Falls back gracefully if the bridge is not running.
     */
    async verifyInboundSecurity(email, session) {
        try {
            const rawMessage = session.emailData || email.toRFC822String();
            const result = await this.rustBridge.verifyEmail({
                rawMessage,
                ip: session.remoteAddress,
                heloDomain: session.clientHostname || '',
                hostname: this.options.hostname,
                mailFrom: session.envelope?.mailFrom?.address || session.mailFrom || '',
            });
            // Apply DKIM result headers
            if (result.dkim && result.dkim.length > 0) {
                const dkimSummary = result.dkim
                    .map(d => `${d.status}${d.domain ? ` (${d.domain})` : ''}`)
                    .join(', ');
                email.addHeader('X-DKIM-Result', dkimSummary);
            }
            // Apply SPF result header
            if (result.spf) {
                email.addHeader('Received-SPF', `${result.spf.result} (domain: ${result.spf.domain}, ip: ${result.spf.ip})`);
                // Mark as spam on SPF hard fail
                if (result.spf.result === 'fail') {
                    email.mightBeSpam = true;
                    logger.log('warn', `SPF fail for ${session.remoteAddress} — marking as potential spam`);
                }
            }
            // Apply DMARC result header and policy
            if (result.dmarc) {
                email.addHeader('X-DMARC-Result', `${result.dmarc.action} (policy=${result.dmarc.policy}, dkim=${result.dmarc.dkim_result}, spf=${result.dmarc.spf_result})`);
                if (result.dmarc.action === 'reject') {
                    email.mightBeSpam = true;
                    logger.log('warn', `DMARC reject for domain ${result.dmarc.domain} — marking as spam`);
                }
                else if (result.dmarc.action === 'quarantine') {
                    email.mightBeSpam = true;
                    logger.log('info', `DMARC quarantine for domain ${result.dmarc.domain} — marking as potential spam`);
                }
            }
            logger.log('info', `Inbound security verified for email from ${session.remoteAddress}: DKIM=${result.dkim?.[0]?.status ?? 'none'}, SPF=${result.spf?.result ?? 'none'}, DMARC=${result.dmarc?.action ?? 'none'}`);
        }
        catch (err) {
            logger.log('warn', `Inbound security verification failed: ${err.message} — accepting email`);
        }
    }
    /**
     * Process email based on routing rules
     */
    async processEmailByMode(emailData, session) {
        // Convert Buffer to Email if needed
        let email;
        if (Buffer.isBuffer(emailData)) {
            // Parse the email data buffer into an Email object
            try {
                const parsed = await plugins.mailparser.simpleParser(emailData);
                email = new Email({
                    from: parsed.from?.value[0]?.address || session.envelope.mailFrom.address,
                    to: session.envelope.rcptTo[0]?.address || '',
                    subject: parsed.subject || '',
                    text: parsed.text || '',
                    html: parsed.html || undefined,
                    attachments: parsed.attachments?.map(att => ({
                        filename: att.filename || '',
                        content: att.content,
                        contentType: att.contentType
                    })) || []
                });
            }
            catch (error) {
                logger.log('error', `Error parsing email data: ${error.message}`);
                throw new Error(`Error parsing email data: ${error.message}`);
            }
        }
        else {
            email = emailData;
        }
        // Run inbound security verification (DKIM/SPF/DMARC) via Rust bridge
        if (session.remoteAddress && session.remoteAddress !== '127.0.0.1') {
            await this.verifyInboundSecurity(email, session);
        }
        // First check if this is a bounce notification email
        // Look for common bounce notification subject patterns
        const subject = email.subject || '';
        const isBounceLike = /mail delivery|delivery (failed|status|notification)|failure notice|returned mail|undeliverable|delivery problem/i.test(subject);
        if (isBounceLike) {
            logger.log('info', `Email subject matches bounce notification pattern: "${subject}"`);
            // Try to process as a bounce
            const isBounce = await this.processBounceNotification(email);
            if (isBounce) {
                logger.log('info', 'Successfully processed as bounce notification, skipping regular processing');
                return email;
            }
            logger.log('info', 'Not a valid bounce notification, continuing with regular processing');
        }
        // Find matching route
        const context = { email, session };
        const route = await this.emailRouter.evaluateRoutes(context);
        if (!route) {
            // No matching route - reject
            throw new Error('No matching route for email');
        }
        // Store matched route in session
        session.matchedRoute = route;
        // Execute action based on route
        await this.executeAction(route.action, email, context);
        // Return the processed email
        return email;
    }
    /**
     * Execute action based on route configuration
     */
    async executeAction(action, email, context) {
        switch (action.type) {
            case 'forward':
                await this.handleForwardAction(action, email, context);
                break;
            case 'process':
                await this.handleProcessAction(action, email, context);
                break;
            case 'deliver':
                await this.handleDeliverAction(action, email, context);
                break;
            case 'reject':
                await this.handleRejectAction(action, email, context);
                break;
            default:
                throw new Error(`Unknown action type: ${action.type}`);
        }
    }
    /**
     * Handle forward action
     */
    async handleForwardAction(_action, email, context) {
        if (!_action.forward) {
            throw new Error('Forward action requires forward configuration');
        }
        const { host, port = 25, auth, addHeaders } = _action.forward;
        logger.log('info', `Forwarding email to ${host}:${port}`);
        // Add forwarding headers
        if (addHeaders) {
            for (const [key, value] of Object.entries(addHeaders)) {
                email.headers[key] = value;
            }
        }
        // Add standard forwarding headers
        email.headers['X-Forwarded-For'] = context.session.remoteAddress || 'unknown';
        email.headers['X-Forwarded-To'] = email.to.join(', ');
        email.headers['X-Forwarded-Date'] = new Date().toISOString();
        // Get SMTP client
        const client = this.getSmtpClient(host, port);
        try {
            // Send email
            await client.sendMail(email);
            logger.log('info', `Successfully forwarded email to ${host}:${port}`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.INFO,
                type: SecurityEventType.EMAIL_FORWARDING,
                message: 'Email forwarded successfully',
                ipAddress: context.session.remoteAddress,
                details: {
                    sessionId: context.session.id,
                    routeName: context.session.matchedRoute?.name,
                    targetHost: host,
                    targetPort: port,
                    recipients: email.to
                },
                success: true
            });
        }
        catch (error) {
            logger.log('error', `Failed to forward email: ${error.message}`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.ERROR,
                type: SecurityEventType.EMAIL_FORWARDING,
                message: 'Email forwarding failed',
                ipAddress: context.session.remoteAddress,
                details: {
                    sessionId: context.session.id,
                    routeName: context.session.matchedRoute?.name,
                    targetHost: host,
                    targetPort: port,
                    error: error.message
                },
                success: false
            });
            // Handle as bounce
            for (const recipient of email.getAllRecipients()) {
                await this.bounceManager.processSmtpFailure(recipient, error.message, {
                    sender: email.from,
                    originalEmailId: email.headers['Message-ID']
                });
            }
            throw error;
        }
    }
    /**
     * Handle process action
     */
    async handleProcessAction(action, email, context) {
        logger.log('info', `Processing email with action options`);
        // Apply scanning if requested
        if (action.process?.scan) {
            // Use existing content scanner
            // Note: ContentScanner integration would go here
            logger.log('info', 'Content scanning requested');
        }
        // Note: DKIM signing will be applied at delivery time to ensure signature validity
        // Queue for delivery
        const queue = action.process?.queue || 'normal';
        await this.deliveryQueue.enqueue(email, 'process', context.session.matchedRoute);
        logger.log('info', `Email queued for delivery in ${queue} queue`);
    }
    /**
     * Handle deliver action
     */
    async handleDeliverAction(_action, email, context) {
        logger.log('info', `Delivering email locally`);
        // Queue for local delivery
        await this.deliveryQueue.enqueue(email, 'mta', context.session.matchedRoute);
        logger.log('info', 'Email queued for local delivery');
    }
    /**
     * Handle reject action
     */
    async handleRejectAction(action, email, context) {
        const code = action.reject?.code || 550;
        const message = action.reject?.message || 'Message rejected';
        logger.log('info', `Rejecting email with code ${code}: ${message}`);
        SecurityLogger.getInstance().logEvent({
            level: SecurityLogLevel.WARN,
            type: SecurityEventType.EMAIL_PROCESSING,
            message: 'Email rejected by routing rule',
            ipAddress: context.session.remoteAddress,
            details: {
                sessionId: context.session.id,
                routeName: context.session.matchedRoute?.name,
                rejectCode: code,
                rejectMessage: message,
                from: email.from,
                to: email.to
            },
            success: false
        });
        // Throw error with SMTP code and message
        const error = new Error(message);
        error.responseCode = code;
        throw error;
    }
    /**
     * Handle email in MTA mode (programmatic processing)
     */
    async _handleMtaMode(email, session) {
        logger.log('info', `Handling email in MTA mode for session ${session.id}`);
        try {
            // Apply MTA rule options if provided
            if (session.matchedRoute?.action.options?.mtaOptions) {
                const options = session.matchedRoute.action.options.mtaOptions;
                // Apply DKIM signing if enabled
                if (options.dkimSign && options.dkimOptions) {
                    const dkimDomain = options.dkimOptions.domainName;
                    const dkimSelector = options.dkimOptions.keySelector || 'mta';
                    logger.log('info', `Signing email with DKIM for domain ${dkimDomain}`);
                    await this.handleDkimSigning(email, dkimDomain, dkimSelector);
                }
            }
            // Get email content for logging/processing
            const subject = email.subject;
            const recipients = email.getAllRecipients().join(', ');
            logger.log('info', `Email processed by MTA: ${subject} to ${recipients}`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.INFO,
                type: SecurityEventType.EMAIL_PROCESSING,
                message: 'Email processed by MTA',
                ipAddress: session.remoteAddress,
                details: {
                    sessionId: session.id,
                    ruleName: session.matchedRoute?.name || 'default',
                    subject,
                    recipients
                },
                success: true
            });
        }
        catch (error) {
            logger.log('error', `Failed to process email in MTA mode: ${error.message}`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.ERROR,
                type: SecurityEventType.EMAIL_PROCESSING,
                message: 'MTA processing failed',
                ipAddress: session.remoteAddress,
                details: {
                    sessionId: session.id,
                    ruleName: session.matchedRoute?.name || 'default',
                    error: error.message
                },
                success: false
            });
            throw error;
        }
    }
    /**
     * Handle email in process mode (store-and-forward with scanning)
     */
    async _handleProcessMode(email, session) {
        logger.log('info', `Handling email in process mode for session ${session.id}`);
        try {
            const route = session.matchedRoute;
            // Apply content scanning if enabled
            if (route?.action.options?.contentScanning && route.action.options.scanners && route.action.options.scanners.length > 0) {
                logger.log('info', 'Performing content scanning');
                // Apply each scanner
                for (const scanner of route.action.options.scanners) {
                    switch (scanner.type) {
                        case 'spam':
                            logger.log('info', 'Scanning for spam content');
                            // Implement spam scanning
                            break;
                        case 'virus':
                            logger.log('info', 'Scanning for virus content');
                            // Implement virus scanning
                            break;
                        case 'attachment':
                            logger.log('info', 'Scanning attachments');
                            // Check for blocked extensions
                            if (scanner.blockedExtensions && scanner.blockedExtensions.length > 0) {
                                for (const attachment of email.attachments) {
                                    const ext = this.getFileExtension(attachment.filename);
                                    if (scanner.blockedExtensions.includes(ext)) {
                                        if (scanner.action === 'reject') {
                                            throw new Error(`Blocked attachment type: ${ext}`);
                                        }
                                        else { // tag
                                            email.addHeader('X-Attachment-Warning', `Potentially unsafe attachment: ${attachment.filename}`);
                                        }
                                    }
                                }
                            }
                            break;
                    }
                }
            }
            // Apply transformations if defined
            if (route?.action.options?.transformations && route.action.options.transformations.length > 0) {
                logger.log('info', 'Applying email transformations');
                for (const transform of route.action.options.transformations) {
                    switch (transform.type) {
                        case 'addHeader':
                            if (transform.header && transform.value) {
                                email.addHeader(transform.header, transform.value);
                            }
                            break;
                    }
                }
            }
            logger.log('info', `Email successfully processed in store-and-forward mode`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.INFO,
                type: SecurityEventType.EMAIL_PROCESSING,
                message: 'Email processed and queued',
                ipAddress: session.remoteAddress,
                details: {
                    sessionId: session.id,
                    ruleName: route?.name || 'default',
                    contentScanning: route?.action.options?.contentScanning || false,
                    subject: email.subject
                },
                success: true
            });
        }
        catch (error) {
            logger.log('error', `Failed to process email: ${error.message}`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.ERROR,
                type: SecurityEventType.EMAIL_PROCESSING,
                message: 'Email processing failed',
                ipAddress: session.remoteAddress,
                details: {
                    sessionId: session.id,
                    ruleName: session.matchedRoute?.name || 'default',
                    error: error.message
                },
                success: false
            });
            throw error;
        }
    }
    /**
     * Get file extension from filename
     */
    getFileExtension(filename) {
        return filename.substring(filename.lastIndexOf('.')).toLowerCase();
    }
    /**
     * Set up DKIM configuration for all domains
     */
    async setupDkimForDomains() {
        const domainConfigs = this.domainRegistry.getAllConfigs();
        if (domainConfigs.length === 0) {
            logger.log('warn', 'No domains configured for DKIM');
            return;
        }
        for (const domainConfig of domainConfigs) {
            const domain = domainConfig.domain;
            const selector = domainConfig.dkim?.selector || 'default';
            try {
                // Check if DKIM keys already exist for this domain
                let keyPair;
                try {
                    // Try to read existing keys
                    keyPair = await this.dkimCreator.readDKIMKeys(domain);
                    logger.log('info', `Using existing DKIM keys for domain: ${domain}`);
                }
                catch (error) {
                    // Generate new keys if they don't exist
                    keyPair = await this.dkimCreator.createDKIMKeys();
                    // Store them for future use
                    await this.dkimCreator.createAndStoreDKIMKeys(domain);
                    logger.log('info', `Generated new DKIM keys for domain: ${domain}`);
                }
                // Store the private key for signing
                this.dkimKeys.set(domain, keyPair.privateKey);
                // DNS record creation is now handled by DnsManager
                logger.log('info', `DKIM keys loaded for domain: ${domain} with selector: ${selector}`);
            }
            catch (error) {
                logger.log('error', `Failed to set up DKIM for domain ${domain}: ${error.message}`);
            }
        }
    }
    /**
     * Apply per-domain rate limits from domain configurations
     */
    applyDomainRateLimits() {
        const domainConfigs = this.domainRegistry.getAllConfigs();
        for (const domainConfig of domainConfigs) {
            if (domainConfig.rateLimits) {
                const domain = domainConfig.domain;
                const rateLimitConfig = {};
                // Convert domain-specific rate limits to the format expected by UnifiedRateLimiter
                if (domainConfig.rateLimits.outbound) {
                    if (domainConfig.rateLimits.outbound.messagesPerMinute) {
                        rateLimitConfig.maxMessagesPerMinute = domainConfig.rateLimits.outbound.messagesPerMinute;
                    }
                    // Note: messagesPerHour and messagesPerDay would need additional implementation in rate limiter
                }
                if (domainConfig.rateLimits.inbound) {
                    if (domainConfig.rateLimits.inbound.messagesPerMinute) {
                        rateLimitConfig.maxMessagesPerMinute = domainConfig.rateLimits.inbound.messagesPerMinute;
                    }
                    if (domainConfig.rateLimits.inbound.connectionsPerIp) {
                        rateLimitConfig.maxConnectionsPerIP = domainConfig.rateLimits.inbound.connectionsPerIp;
                    }
                    if (domainConfig.rateLimits.inbound.recipientsPerMessage) {
                        rateLimitConfig.maxRecipientsPerMessage = domainConfig.rateLimits.inbound.recipientsPerMessage;
                    }
                }
                // Apply the rate limits if we have any
                if (Object.keys(rateLimitConfig).length > 0) {
                    this.rateLimiter.applyDomainLimits(domain, rateLimitConfig);
                    logger.log('info', `Applied rate limits for domain ${domain}:`, rateLimitConfig);
                }
            }
        }
    }
    /**
     * Check and rotate DKIM keys if needed
     */
    async checkAndRotateDkimKeys() {
        const domainConfigs = this.domainRegistry.getAllConfigs();
        for (const domainConfig of domainConfigs) {
            const domain = domainConfig.domain;
            const selector = domainConfig.dkim?.selector || 'default';
            const rotateKeys = domainConfig.dkim?.rotateKeys || false;
            const rotationInterval = domainConfig.dkim?.rotationInterval || 90;
            const keySize = domainConfig.dkim?.keySize || 2048;
            if (!rotateKeys) {
                logger.log('debug', `DKIM key rotation disabled for ${domain}`);
                continue;
            }
            try {
                // Check if keys need rotation
                const needsRotation = await this.dkimCreator.needsRotation(domain, selector, rotationInterval);
                if (needsRotation) {
                    logger.log('info', `DKIM keys need rotation for ${domain} (selector: ${selector})`);
                    // Rotate the keys
                    const newSelector = await this.dkimCreator.rotateDkimKeys(domain, selector, keySize);
                    // Update the domain config with new selector
                    domainConfig.dkim = {
                        ...domainConfig.dkim,
                        selector: newSelector
                    };
                    // Re-register DNS handler for new selector if internal-dns mode
                    if (domainConfig.dnsMode === 'internal-dns' && this.dcRouter.dnsServer) {
                        // Get new public key
                        const keyPair = await this.dkimCreator.readDKIMKeysForSelector(domain, newSelector);
                        const publicKeyBase64 = keyPair.publicKey
                            .replace(/-----BEGIN PUBLIC KEY-----/g, '')
                            .replace(/-----END PUBLIC KEY-----/g, '')
                            .replace(/\s/g, '');
                        const ttl = domainConfig.dns?.internal?.ttl || 3600;
                        // Register new selector
                        this.dcRouter.dnsServer.registerHandler(`${newSelector}._domainkey.${domain}`, ['TXT'], () => ({
                            name: `${newSelector}._domainkey.${domain}`,
                            type: 'TXT',
                            class: 'IN',
                            ttl: ttl,
                            data: `v=DKIM1; k=rsa; p=${publicKeyBase64}`
                        }));
                        logger.log('info', `DKIM DNS handler registered for new selector: ${newSelector}._domainkey.${domain}`);
                        // Store the updated public key in storage
                        await this.dcRouter.storageManager.set(`/email/dkim/${domain}/public.key`, keyPair.publicKey);
                    }
                    // Clean up old keys after grace period (async, don't wait)
                    this.dkimCreator.cleanupOldKeys(domain, 30).catch(error => {
                        logger.log('warn', `Failed to cleanup old DKIM keys for ${domain}: ${error.message}`);
                    });
                }
                else {
                    logger.log('debug', `DKIM keys for ${domain} are up to date`);
                }
            }
            catch (error) {
                logger.log('error', `Failed to check/rotate DKIM keys for ${domain}: ${error.message}`);
            }
        }
    }
    /**
     * Generate SmartProxy routes for email ports
     */
    generateProxyRoutes(portMapping) {
        const routes = [];
        const defaultPortMapping = {
            25: 10025,
            587: 10587,
            465: 10465
        };
        const actualPortMapping = portMapping || defaultPortMapping;
        // Generate routes for each configured port
        for (const externalPort of this.options.ports) {
            const internalPort = actualPortMapping[externalPort] || externalPort + 10000;
            let routeName = 'email-route';
            let tlsMode = 'passthrough';
            // Configure based on port
            switch (externalPort) {
                case 25:
                    routeName = 'smtp-route';
                    tlsMode = 'passthrough'; // STARTTLS
                    break;
                case 587:
                    routeName = 'submission-route';
                    tlsMode = 'passthrough'; // STARTTLS
                    break;
                case 465:
                    routeName = 'smtps-route';
                    tlsMode = 'terminate'; // Implicit TLS
                    break;
                default:
                    routeName = `email-port-${externalPort}-route`;
            }
            routes.push({
                name: routeName,
                match: {
                    ports: [externalPort]
                },
                action: {
                    type: 'forward',
                    target: {
                        host: 'localhost',
                        port: internalPort
                    },
                    tls: {
                        mode: tlsMode
                    }
                }
            });
        }
        return routes;
    }
    /**
     * Update server configuration
     */
    updateOptions(options) {
        // Stop the server if changing ports
        const portsChanged = options.ports &&
            (!this.options.ports ||
                JSON.stringify(options.ports) !== JSON.stringify(this.options.ports));
        if (portsChanged) {
            this.stop().then(() => {
                this.options = { ...this.options, ...options };
                this.start();
            });
        }
        else {
            // Update options without restart
            this.options = { ...this.options, ...options };
            // Update domain registry if domains changed
            if (options.domains) {
                this.domainRegistry = new DomainRegistry(options.domains, options.defaults || this.options.defaults);
            }
            // Update email router if routes changed
            if (options.routes) {
                this.emailRouter.updateRoutes(options.routes);
            }
        }
    }
    /**
     * Update email routes
     */
    updateEmailRoutes(routes) {
        this.options.routes = routes;
        this.emailRouter.updateRoutes(routes);
    }
    /**
     * Get server statistics
     */
    getStats() {
        return { ...this.stats };
    }
    /**
     * Get domain registry
     */
    getDomainRegistry() {
        return this.domainRegistry;
    }
    /**
     * Update email routes dynamically
     */
    updateRoutes(routes) {
        this.emailRouter.setRoutes(routes);
        logger.log('info', `Updated email routes with ${routes.length} routes`);
    }
    /**
     * Send an email through the delivery system
     * @param email The email to send
     * @param mode The processing mode to use
     * @param rule Optional rule to apply
     * @param options Optional sending options
     * @returns The ID of the queued email
     */
    async sendEmail(email, mode = 'mta', route, options) {
        logger.log('info', `Sending email: ${email.subject} to ${email.to.join(', ')}`);
        try {
            // Validate the email
            if (!email.from) {
                throw new Error('Email must have a sender address');
            }
            if (!email.to || email.to.length === 0) {
                throw new Error('Email must have at least one recipient');
            }
            // Check if any recipients are on the suppression list (unless explicitly skipped)
            if (!options?.skipSuppressionCheck) {
                const suppressedRecipients = email.to.filter(recipient => this.isEmailSuppressed(recipient));
                if (suppressedRecipients.length > 0) {
                    // Filter out suppressed recipients
                    const originalCount = email.to.length;
                    const suppressed = suppressedRecipients.map(recipient => {
                        const info = this.getSuppressionInfo(recipient);
                        return {
                            email: recipient,
                            reason: info?.reason || 'Unknown',
                            until: info?.expiresAt ? new Date(info.expiresAt).toISOString() : 'permanent'
                        };
                    });
                    logger.log('warn', `Filtering out ${suppressedRecipients.length} suppressed recipient(s)`, { suppressed });
                    // If all recipients are suppressed, throw an error
                    if (suppressedRecipients.length === originalCount) {
                        throw new Error('All recipients are on the suppression list');
                    }
                    // Filter the recipients list to only include non-suppressed addresses
                    email.to = email.to.filter(recipient => !this.isEmailSuppressed(recipient));
                }
            }
            // IP warmup handling
            let ipAddress = options?.ipAddress;
            // If no specific IP was provided, use IP warmup manager to find the best IP
            if (!ipAddress) {
                const domain = email.from.split('@')[1];
                ipAddress = this.getBestIPForSending({
                    from: email.from,
                    to: email.to,
                    domain,
                    isTransactional: options?.isTransactional
                });
                if (ipAddress) {
                    logger.log('info', `Selected IP ${ipAddress} for sending based on warmup status`);
                }
            }
            // If an IP is provided or selected by warmup manager, check its capacity
            if (ipAddress) {
                // Check if the IP can send more today
                if (!this.canIPSendMoreToday(ipAddress)) {
                    logger.log('warn', `IP ${ipAddress} has reached its daily sending limit, email will be queued for later delivery`);
                }
                // Check if the IP can send more this hour
                if (!this.canIPSendMoreThisHour(ipAddress)) {
                    logger.log('warn', `IP ${ipAddress} has reached its hourly sending limit, email will be queued for later delivery`);
                }
                // Record the send for IP warmup tracking
                this.recordIPSend(ipAddress);
                // Add IP header to the email
                email.addHeader('X-Sending-IP', ipAddress);
            }
            // Check if the sender domain has DKIM keys and sign the email if needed
            if (mode === 'mta' && route?.action.options?.mtaOptions?.dkimSign) {
                const domain = email.from.split('@')[1];
                await this.handleDkimSigning(email, domain, route.action.options.mtaOptions.dkimOptions?.keySelector || 'mta');
            }
            // Generate a unique ID for this email
            const id = plugins.uuid.v4();
            // Queue the email for delivery
            await this.deliveryQueue.enqueue(email, mode, route);
            // Record 'sent' event for domain reputation monitoring
            const senderDomain = email.from.split('@')[1];
            if (senderDomain) {
                this.recordReputationEvent(senderDomain, {
                    type: 'sent',
                    count: email.to.length
                });
            }
            logger.log('info', `Email queued with ID: ${id}`);
            return id;
        }
        catch (error) {
            logger.log('error', `Failed to send email: ${error.message}`);
            throw error;
        }
    }
    /**
     * Handle DKIM signing for an email
     * @param email The email to sign
     * @param domain The domain to sign with
     * @param selector The DKIM selector
     */
    async handleDkimSigning(email, domain, selector) {
        try {
            // Ensure we have DKIM keys for this domain
            await this.dkimCreator.handleDKIMKeysForDomain(domain);
            // Get the private key
            const { privateKey } = await this.dkimCreator.readDKIMKeys(domain);
            // Convert Email to raw format for signing
            const rawEmail = email.toRFC822String();
            // Sign the email via Rust bridge
            const signResult = await this.rustBridge.signDkim({
                rawMessage: rawEmail,
                domain,
                selector,
                privateKey,
            });
            if (signResult.header) {
                email.addHeader('DKIM-Signature', signResult.header);
                logger.log('info', `Successfully added DKIM signature for ${domain}`);
            }
        }
        catch (error) {
            logger.log('error', `Failed to sign email with DKIM: ${error.message}`);
            // Continue without DKIM rather than failing the send
        }
    }
    /**
     * Process a bounce notification email
     * @param bounceEmail The email containing bounce notification information
     * @returns Processed bounce record or null if not a bounce
     */
    async processBounceNotification(bounceEmail) {
        logger.log('info', 'Processing potential bounce notification email');
        try {
            // Process as a bounce notification (no conversion needed anymore)
            const bounceRecord = await this.bounceManager.processBounceEmail(bounceEmail);
            if (bounceRecord) {
                logger.log('info', `Successfully processed bounce notification for ${bounceRecord.recipient}`, {
                    bounceType: bounceRecord.bounceType,
                    bounceCategory: bounceRecord.bounceCategory
                });
                // Notify any registered listeners about the bounce
                this.emit('bounceProcessed', bounceRecord);
                // Record bounce event for domain reputation tracking
                if (bounceRecord.domain) {
                    this.recordReputationEvent(bounceRecord.domain, {
                        type: 'bounce',
                        hardBounce: bounceRecord.bounceCategory === BounceCategory.HARD,
                        receivingDomain: bounceRecord.recipient.split('@')[1]
                    });
                }
                // Log security event
                SecurityLogger.getInstance().logEvent({
                    level: SecurityLogLevel.INFO,
                    type: SecurityEventType.EMAIL_VALIDATION,
                    message: `Bounce notification processed for recipient`,
                    domain: bounceRecord.domain,
                    details: {
                        recipient: bounceRecord.recipient,
                        bounceType: bounceRecord.bounceType,
                        bounceCategory: bounceRecord.bounceCategory
                    },
                    success: true
                });
                return true;
            }
            else {
                logger.log('info', 'Email not recognized as a bounce notification');
                return false;
            }
        }
        catch (error) {
            logger.log('error', `Error processing bounce notification: ${error.message}`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.ERROR,
                type: SecurityEventType.EMAIL_VALIDATION,
                message: 'Failed to process bounce notification',
                details: {
                    error: error.message,
                    subject: bounceEmail.subject
                },
                success: false
            });
            return false;
        }
    }
    /**
     * Process an SMTP failure as a bounce
     * @param recipient Recipient email that failed
     * @param smtpResponse SMTP error response
     * @param options Additional options for bounce processing
     * @returns Processed bounce record
     */
    async processSmtpFailure(recipient, smtpResponse, options = {}) {
        logger.log('info', `Processing SMTP failure for ${recipient}: ${smtpResponse}`);
        try {
            // Process the SMTP failure through the bounce manager
            const bounceRecord = await this.bounceManager.processSmtpFailure(recipient, smtpResponse, options);
            logger.log('info', `Successfully processed SMTP failure for ${recipient} as ${bounceRecord.bounceCategory} bounce`, {
                bounceType: bounceRecord.bounceType
            });
            // Notify any registered listeners about the bounce
            this.emit('bounceProcessed', bounceRecord);
            // Record bounce event for domain reputation tracking
            if (bounceRecord.domain) {
                this.recordReputationEvent(bounceRecord.domain, {
                    type: 'bounce',
                    hardBounce: bounceRecord.bounceCategory === BounceCategory.HARD,
                    receivingDomain: bounceRecord.recipient.split('@')[1]
                });
            }
            // Log security event
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.INFO,
                type: SecurityEventType.EMAIL_VALIDATION,
                message: `SMTP failure processed for recipient`,
                domain: bounceRecord.domain,
                details: {
                    recipient: bounceRecord.recipient,
                    bounceType: bounceRecord.bounceType,
                    bounceCategory: bounceRecord.bounceCategory,
                    smtpResponse
                },
                success: true
            });
            return true;
        }
        catch (error) {
            logger.log('error', `Error processing SMTP failure: ${error.message}`);
            SecurityLogger.getInstance().logEvent({
                level: SecurityLogLevel.ERROR,
                type: SecurityEventType.EMAIL_VALIDATION,
                message: 'Failed to process SMTP failure',
                details: {
                    recipient,
                    smtpResponse,
                    error: error.message
                },
                success: false
            });
            return false;
        }
    }
    /**
     * Check if an email address is suppressed (has bounced previously)
     * @param email Email address to check
     * @returns Whether the email is suppressed
     */
    isEmailSuppressed(email) {
        return this.bounceManager.isEmailSuppressed(email);
    }
    /**
     * Get suppression information for an email
     * @param email Email address to check
     * @returns Suppression information or null if not suppressed
     */
    getSuppressionInfo(email) {
        return this.bounceManager.getSuppressionInfo(email);
    }
    /**
     * Get bounce history information for an email
     * @param email Email address to check
     * @returns Bounce history or null if no bounces
     */
    getBounceHistory(email) {
        return this.bounceManager.getBounceInfo(email);
    }
    /**
     * Get all suppressed email addresses
     * @returns Array of suppressed email addresses
     */
    getSuppressionList() {
        return this.bounceManager.getSuppressionList();
    }
    /**
     * Get all hard bounced email addresses
     * @returns Array of hard bounced email addresses
     */
    getHardBouncedAddresses() {
        return this.bounceManager.getHardBouncedAddresses();
    }
    /**
     * Add an email to the suppression list
     * @param email Email address to suppress
     * @param reason Reason for suppression
     * @param expiresAt Optional expiration time (undefined for permanent)
     */
    addToSuppressionList(email, reason, expiresAt) {
        this.bounceManager.addToSuppressionList(email, reason, expiresAt);
        logger.log('info', `Added ${email} to suppression list: ${reason}`);
    }
    /**
     * Remove an email from the suppression list
     * @param email Email address to remove from suppression
     */
    removeFromSuppressionList(email) {
        this.bounceManager.removeFromSuppressionList(email);
        logger.log('info', `Removed ${email} from suppression list`);
    }
    /**
     * Get the status of IP warmup process
     * @param ipAddress Optional specific IP to check
     * @returns Status of IP warmup
     */
    getIPWarmupStatus(ipAddress) {
        return this.ipWarmupManager.getWarmupStatus(ipAddress);
    }
    /**
     * Add a new IP address to the warmup process
     * @param ipAddress IP address to add
     */
    addIPToWarmup(ipAddress) {
        this.ipWarmupManager.addIPToWarmup(ipAddress);
    }
    /**
     * Remove an IP address from the warmup process
     * @param ipAddress IP address to remove
     */
    removeIPFromWarmup(ipAddress) {
        this.ipWarmupManager.removeIPFromWarmup(ipAddress);
    }
    /**
     * Update metrics for an IP in the warmup process
     * @param ipAddress IP address
     * @param metrics Metrics to update
     */
    updateIPWarmupMetrics(ipAddress, metrics) {
        this.ipWarmupManager.updateMetrics(ipAddress, metrics);
    }
    /**
     * Check if an IP can send more emails today
     * @param ipAddress IP address to check
     * @returns Whether the IP can send more today
     */
    canIPSendMoreToday(ipAddress) {
        return this.ipWarmupManager.canSendMoreToday(ipAddress);
    }
    /**
     * Check if an IP can send more emails in the current hour
     * @param ipAddress IP address to check
     * @returns Whether the IP can send more this hour
     */
    canIPSendMoreThisHour(ipAddress) {
        return this.ipWarmupManager.canSendMoreThisHour(ipAddress);
    }
    /**
     * Get the best IP to use for sending an email based on warmup status
     * @param emailInfo Information about the email being sent
     * @returns Best IP to use or null
     */
    getBestIPForSending(emailInfo) {
        return this.ipWarmupManager.getBestIPForSending(emailInfo);
    }
    /**
     * Set the active IP allocation policy for warmup
     * @param policyName Name of the policy to set
     */
    setIPAllocationPolicy(policyName) {
        this.ipWarmupManager.setActiveAllocationPolicy(policyName);
    }
    /**
     * Record that an email was sent using a specific IP
     * @param ipAddress IP address used for sending
     */
    recordIPSend(ipAddress) {
        this.ipWarmupManager.recordSend(ipAddress);
    }
    /**
     * Get reputation data for a domain
     * @param domain Domain to get reputation for
     * @returns Domain reputation metrics
     */
    getDomainReputationData(domain) {
        return this.senderReputationMonitor.getReputationData(domain);
    }
    /**
     * Get summary reputation data for all monitored domains
     * @returns Summary data for all domains
     */
    getReputationSummary() {
        return this.senderReputationMonitor.getReputationSummary();
    }
    /**
     * Add a domain to the reputation monitoring system
     * @param domain Domain to add
     */
    addDomainToMonitoring(domain) {
        this.senderReputationMonitor.addDomain(domain);
    }
    /**
     * Remove a domain from the reputation monitoring system
     * @param domain Domain to remove
     */
    removeDomainFromMonitoring(domain) {
        this.senderReputationMonitor.removeDomain(domain);
    }
    /**
     * Record an email event for domain reputation tracking
     * @param domain Domain sending the email
     * @param event Event details
     */
    recordReputationEvent(domain, event) {
        this.senderReputationMonitor.recordSendEvent(domain, event);
    }
    /**
     * Check if DKIM key exists for a domain
     * @param domain Domain to check
     */
    hasDkimKey(domain) {
        return this.dkimKeys.has(domain);
    }
    /**
     * Record successful email delivery
     * @param domain Sending domain
     */
    recordDelivery(domain) {
        this.recordReputationEvent(domain, {
            type: 'delivered',
            count: 1
        });
    }
    /**
     * Record email bounce
     * @param domain Sending domain
     * @param receivingDomain Receiving domain that bounced
     * @param bounceType Type of bounce (hard/soft)
     * @param reason Bounce reason
     */
    recordBounce(domain, receivingDomain, bounceType, reason) {
        // Record bounce in bounce manager
        const bounceRecord = {
            id: `bounce_${Date.now()}_${Math.random().toString(36).substring(2, 9)}`,
            recipient: `user@${receivingDomain}`,
            sender: `user@${domain}`,
            domain: domain,
            bounceType: bounceType === 'hard' ? BounceType.INVALID_RECIPIENT : BounceType.TEMPORARY_FAILURE,
            bounceCategory: bounceType === 'hard' ? BounceCategory.HARD : BounceCategory.SOFT,
            timestamp: Date.now(),
            smtpResponse: reason,
            diagnosticCode: reason,
            statusCode: bounceType === 'hard' ? '550' : '450',
            processed: false
        };
        // Process the bounce
        this.bounceManager.processBounce(bounceRecord);
        // Record reputation event
        this.recordReputationEvent(domain, {
            type: 'bounce',
            count: 1,
            hardBounce: bounceType === 'hard',
            receivingDomain
        });
    }
    /**
     * Get the rate limiter instance
     * @returns The unified rate limiter
     */
    getRateLimiter() {
        return this.rateLimiter;
    }
}
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