/**
 * SMTP Server
 * Core implementation for the refactored SMTP server
 */
import type { ISmtpServerOptions } from './interfaces.js';
import type { ISmtpServer, ISmtpServerConfig, ISessionManager, IConnectionManager, ICommandHandler, IDataHandler, ITlsHandler, ISecurityHandler } from './interfaces.js';
import { UnifiedEmailServer } from '../../routing/classes.unified.email.server.js';
/**
 * SMTP Server implementation
 * The main server class that coordinates all components
 */
export declare class SmtpServer implements ISmtpServer {
    /**
     * Email server reference
     */
    private emailServer;
    /**
     * Session manager
     */
    private sessionManager;
    /**
     * Connection manager
     */
    private connectionManager;
    /**
     * Command handler
     */
    private commandHandler;
    /**
     * Data handler
     */
    private dataHandler;
    /**
     * TLS handler
     */
    private tlsHandler;
    /**
     * Security handler
     */
    private securityHandler;
    /**
     * SMTP server options
     */
    private options;
    /**
     * Net server instance
     */
    private server;
    /**
     * Secure server instance
     */
    private secureServer;
    /**
     * Whether the server is running
     */
    private running;
    /**
     * Server recovery state
     */
    private recoveryState;
    /**
     * Creates a new SMTP server
     * @param config - Server configuration
     */
    constructor(config: ISmtpServerConfig);
    /**
     * Start the SMTP server
     * @returns Promise that resolves when server is started
     */
    listen(): Promise<void>;
    /**
     * Stop the SMTP server
     * @returns Promise that resolves when server is stopped
     */
    close(): Promise<void>;
    /**
     * Get the session manager
     * @returns Session manager instance
     */
    getSessionManager(): ISessionManager;
    /**
     * Get the connection manager
     * @returns Connection manager instance
     */
    getConnectionManager(): IConnectionManager;
    /**
     * Get the command handler
     * @returns Command handler instance
     */
    getCommandHandler(): ICommandHandler;
    /**
     * Get the data handler
     * @returns Data handler instance
     */
    getDataHandler(): IDataHandler;
    /**
     * Get the TLS handler
     * @returns TLS handler instance
     */
    getTlsHandler(): ITlsHandler;
    /**
     * Get the security handler
     * @returns Security handler instance
     */
    getSecurityHandler(): ISecurityHandler;
    /**
     * Get the server options
     * @returns SMTP server options
     */
    getOptions(): ISmtpServerOptions;
    /**
     * Get the email server reference
     * @returns Email server instance
     */
    getEmailServer(): UnifiedEmailServer;
    /**
     * Check if the server is running
     * @returns Whether the server is running
     */
    isRunning(): boolean;
    /**
     * Check if we should attempt to recover from an error
     * @param error - The error that occurred
     * @returns Whether recovery should be attempted
     */
    private shouldAttemptRecovery;
    /**
     * Attempt to recover the server after a critical error
     * @param serverType - The type of server to recover ('standard' or 'secure')
     * @param error - The error that triggered recovery
     */
    private attemptServerRecovery;
    /**
     * Clean up all component resources
     */
    destroy(): Promise<void>;
}