781 lines
57 KiB
JavaScript
781 lines
57 KiB
JavaScript
import * as plugins from '../../plugins.js';
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import * as paths from '../../paths.js';
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import { logger } from '../../logger.js';
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import { SecurityLogger, SecurityLogLevel, SecurityEventType } from '../../security/index.js';
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import { LRUCache } from 'lru-cache';
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/**
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* Bounce types for categorizing the reasons for bounces
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*/
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export var BounceType;
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(function (BounceType) {
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// Hard bounces (permanent failures)
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BounceType["INVALID_RECIPIENT"] = "invalid_recipient";
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BounceType["DOMAIN_NOT_FOUND"] = "domain_not_found";
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BounceType["MAILBOX_FULL"] = "mailbox_full";
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BounceType["MAILBOX_INACTIVE"] = "mailbox_inactive";
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BounceType["BLOCKED"] = "blocked";
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BounceType["SPAM_RELATED"] = "spam_related";
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BounceType["POLICY_RELATED"] = "policy_related";
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// Soft bounces (temporary failures)
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BounceType["SERVER_UNAVAILABLE"] = "server_unavailable";
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BounceType["TEMPORARY_FAILURE"] = "temporary_failure";
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BounceType["QUOTA_EXCEEDED"] = "quota_exceeded";
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BounceType["NETWORK_ERROR"] = "network_error";
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BounceType["TIMEOUT"] = "timeout";
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// Special cases
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BounceType["AUTO_RESPONSE"] = "auto_response";
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BounceType["CHALLENGE_RESPONSE"] = "challenge_response";
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BounceType["UNKNOWN"] = "unknown";
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})(BounceType || (BounceType = {}));
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/**
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* Hard vs soft bounce classification
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*/
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export var BounceCategory;
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(function (BounceCategory) {
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BounceCategory["HARD"] = "hard";
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BounceCategory["SOFT"] = "soft";
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BounceCategory["AUTO_RESPONSE"] = "auto_response";
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BounceCategory["UNKNOWN"] = "unknown";
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})(BounceCategory || (BounceCategory = {}));
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/**
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* Email bounce patterns to identify bounce types in SMTP responses and bounce messages
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*/
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const BOUNCE_PATTERNS = {
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// Hard bounce patterns
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[BounceType.INVALID_RECIPIENT]: [
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/no such user/i,
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/user unknown/i,
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/does not exist/i,
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/invalid recipient/i,
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/unknown recipient/i,
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/no mailbox/i,
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/user not found/i,
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/recipient address rejected/i,
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/550 5\.1\.1/i
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],
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[BounceType.DOMAIN_NOT_FOUND]: [
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/domain not found/i,
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/unknown domain/i,
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/no such domain/i,
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/host not found/i,
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/domain invalid/i,
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/550 5\.1\.2/i
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],
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[BounceType.MAILBOX_FULL]: [
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/mailbox full/i,
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/over quota/i,
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/quota exceeded/i,
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/552 5\.2\.2/i
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],
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[BounceType.MAILBOX_INACTIVE]: [
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/mailbox disabled/i,
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/mailbox inactive/i,
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/account disabled/i,
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/mailbox not active/i,
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/account suspended/i
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],
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[BounceType.BLOCKED]: [
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/blocked/i,
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/rejected/i,
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/denied/i,
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/blacklisted/i,
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/prohibited/i,
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/refused/i,
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/550 5\.7\./i
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],
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[BounceType.SPAM_RELATED]: [
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/spam/i,
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/bulk mail/i,
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/content rejected/i,
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/message rejected/i,
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/550 5\.7\.1/i
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],
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// Soft bounce patterns
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[BounceType.SERVER_UNAVAILABLE]: [
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/server unavailable/i,
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/service unavailable/i,
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/try again later/i,
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/try later/i,
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/451 4\.3\./i,
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/421 4\.3\./i
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],
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[BounceType.TEMPORARY_FAILURE]: [
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/temporary failure/i,
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/temporary error/i,
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/temporary problem/i,
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/try again/i,
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/451 4\./i
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],
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[BounceType.QUOTA_EXCEEDED]: [
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/quota temporarily exceeded/i,
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/mailbox temporarily full/i,
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/452 4\.2\.2/i
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],
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[BounceType.NETWORK_ERROR]: [
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/network error/i,
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/connection error/i,
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/connection timed out/i,
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/routing error/i,
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/421 4\.4\./i
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],
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[BounceType.TIMEOUT]: [
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/timed out/i,
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/timeout/i,
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/450 4\.4\.2/i
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],
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// Auto-responses
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[BounceType.AUTO_RESPONSE]: [
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/auto[- ]reply/i,
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/auto[- ]response/i,
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/vacation/i,
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/out of office/i,
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/away from office/i,
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/on vacation/i,
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/automatic reply/i
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],
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[BounceType.CHALLENGE_RESPONSE]: [
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/challenge[- ]response/i,
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/verify your email/i,
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/confirm your email/i,
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/email verification/i
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]
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};
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/**
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* Manager for handling email bounces
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*/
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export class BounceManager {
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// Retry strategy with exponential backoff
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retryStrategy = {
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maxRetries: 5,
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initialDelay: 15 * 60 * 1000, // 15 minutes
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maxDelay: 24 * 60 * 60 * 1000, // 24 hours
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backoffFactor: 2
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};
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// Store of bounced emails
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bounceStore = [];
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// Cache of recently bounced email addresses to avoid sending to known bad addresses
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bounceCache;
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// Suppression list for addresses that should not receive emails
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suppressionList = new Map();
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storageManager; // StorageManager instance
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constructor(options) {
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// Set retry strategy with defaults
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if (options?.retryStrategy) {
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this.retryStrategy = {
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...this.retryStrategy,
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...options.retryStrategy
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};
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}
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// Initialize bounce cache with LRU (least recently used) caching
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this.bounceCache = new LRUCache({
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max: options?.maxCacheSize || 10000,
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ttl: options?.cacheTTL || 30 * 24 * 60 * 60 * 1000, // 30 days default
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});
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// Store storage manager reference
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this.storageManager = options?.storageManager;
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// Load suppression list from storage
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// Note: This is async but we can't await in constructor
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// The suppression list will be loaded asynchronously
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this.loadSuppressionList().catch(error => {
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logger.log('error', `Failed to load suppression list on startup: ${error.message}`);
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});
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}
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/**
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* Process a bounce notification
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* @param bounceData Bounce data to process
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* @returns Processed bounce record
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*/
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async processBounce(bounceData) {
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try {
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// Add required fields if missing
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const bounce = {
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id: bounceData.id || plugins.uuid.v4(),
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recipient: bounceData.recipient,
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sender: bounceData.sender,
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domain: bounceData.domain || bounceData.recipient.split('@')[1],
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subject: bounceData.subject,
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bounceType: bounceData.bounceType || BounceType.UNKNOWN,
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bounceCategory: bounceData.bounceCategory || BounceCategory.UNKNOWN,
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timestamp: bounceData.timestamp || Date.now(),
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smtpResponse: bounceData.smtpResponse,
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diagnosticCode: bounceData.diagnosticCode,
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statusCode: bounceData.statusCode,
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headers: bounceData.headers,
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processed: false,
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originalEmailId: bounceData.originalEmailId,
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retryCount: bounceData.retryCount || 0,
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nextRetryTime: bounceData.nextRetryTime
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};
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// Determine bounce type and category if not provided
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if (!bounceData.bounceType || bounceData.bounceType === BounceType.UNKNOWN) {
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const bounceInfo = this.detectBounceType(bounce.smtpResponse || '', bounce.diagnosticCode || '', bounce.statusCode || '');
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bounce.bounceType = bounceInfo.type;
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bounce.bounceCategory = bounceInfo.category;
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}
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// Process the bounce based on category
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switch (bounce.bounceCategory) {
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case BounceCategory.HARD:
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// Handle hard bounce - add to suppression list
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await this.handleHardBounce(bounce);
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break;
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case BounceCategory.SOFT:
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// Handle soft bounce - schedule retry if eligible
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await this.handleSoftBounce(bounce);
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break;
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case BounceCategory.AUTO_RESPONSE:
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// Handle auto-response - typically no action needed
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logger.log('info', `Auto-response detected for ${bounce.recipient}`);
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break;
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default:
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// Unknown bounce type - log for investigation
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logger.log('warn', `Unknown bounce type for ${bounce.recipient}`, {
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bounceType: bounce.bounceType,
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smtpResponse: bounce.smtpResponse
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});
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break;
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}
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// Store the bounce record
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bounce.processed = true;
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this.bounceStore.push(bounce);
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// Update the bounce cache
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this.updateBounceCache(bounce);
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// Log the bounce
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logger.log(bounce.bounceCategory === BounceCategory.HARD ? 'warn' : 'info', `Email bounce processed: ${bounce.bounceCategory} bounce for ${bounce.recipient}`, {
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bounceType: bounce.bounceType,
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domain: bounce.domain,
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category: bounce.bounceCategory
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});
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// Enhanced security logging
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SecurityLogger.getInstance().logEvent({
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level: bounce.bounceCategory === BounceCategory.HARD
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? SecurityLogLevel.WARN
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: SecurityLogLevel.INFO,
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type: SecurityEventType.EMAIL_VALIDATION,
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message: `Email bounce detected: ${bounce.bounceCategory} bounce for recipient`,
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domain: bounce.domain,
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details: {
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recipient: bounce.recipient,
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bounceType: bounce.bounceType,
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smtpResponse: bounce.smtpResponse,
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diagnosticCode: bounce.diagnosticCode,
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statusCode: bounce.statusCode
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},
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success: false
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});
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return bounce;
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}
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catch (error) {
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logger.log('error', `Error processing bounce: ${error.message}`, {
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error: error.message,
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bounceData
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});
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throw error;
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}
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}
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/**
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* Process an SMTP failure as a bounce
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* @param recipient Recipient email
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* @param smtpResponse SMTP error response
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* @param options Additional options
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* @returns Processed bounce record
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*/
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async processSmtpFailure(recipient, smtpResponse, options = {}) {
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// Create bounce data from SMTP failure
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const bounceData = {
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recipient,
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sender: options.sender || '',
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domain: recipient.split('@')[1],
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smtpResponse,
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statusCode: options.statusCode,
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headers: options.headers,
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originalEmailId: options.originalEmailId,
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timestamp: Date.now()
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};
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// Process as a regular bounce
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return this.processBounce(bounceData);
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}
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/**
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* Process a bounce notification email
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* @param bounceEmail The email containing bounce information
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* @returns Processed bounce record or null if not a bounce
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*/
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async processBounceEmail(bounceEmail) {
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try {
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// Check if this is a bounce notification
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const subject = bounceEmail.getSubject();
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const body = bounceEmail.getBody();
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// Check for common bounce notification subject patterns
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const isBounceSubject = /mail delivery|delivery (failed|status|notification)|failure notice|returned mail|undeliverable|delivery problem/i.test(subject);
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if (!isBounceSubject) {
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// Not a bounce notification based on subject
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return null;
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}
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// Extract original recipient from the body or headers
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let recipient = '';
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let originalMessageId = '';
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// Extract recipient from common bounce formats
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const recipientMatch = body.match(/(?:failed recipient|to[:=]\s*|recipient:|delivery failed:)\s*<?([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})>?/i);
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if (recipientMatch && recipientMatch[1]) {
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recipient = recipientMatch[1];
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}
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// Extract diagnostic code
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let diagnosticCode = '';
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const diagnosticMatch = body.match(/diagnostic(?:-|\\s+)code:\s*(.+)(?:\n|$)/i);
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if (diagnosticMatch && diagnosticMatch[1]) {
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diagnosticCode = diagnosticMatch[1].trim();
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}
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// Extract SMTP status code
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let statusCode = '';
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const statusMatch = body.match(/status(?:-|\\s+)code:\s*([0-9.]+)/i);
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if (statusMatch && statusMatch[1]) {
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statusCode = statusMatch[1].trim();
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}
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// If recipient not found in standard patterns, try DSN (Delivery Status Notification) format
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if (!recipient) {
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// Look for DSN format with Original-Recipient or Final-Recipient fields
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const originalRecipientMatch = body.match(/original-recipient:.*?([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})/i);
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const finalRecipientMatch = body.match(/final-recipient:.*?([a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,})/i);
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if (originalRecipientMatch && originalRecipientMatch[1]) {
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recipient = originalRecipientMatch[1];
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}
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else if (finalRecipientMatch && finalRecipientMatch[1]) {
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recipient = finalRecipientMatch[1];
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}
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}
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// If still no recipient, can't process as bounce
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if (!recipient) {
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logger.log('warn', 'Could not extract recipient from bounce notification', {
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subject,
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sender: bounceEmail.from
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});
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return null;
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}
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// Extract original message ID if available
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const messageIdMatch = body.match(/original[ -]message[ -]id:[ \t]*<?([^>]+)>?/i);
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if (messageIdMatch && messageIdMatch[1]) {
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originalMessageId = messageIdMatch[1].trim();
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}
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// Create bounce data
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const bounceData = {
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recipient,
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sender: bounceEmail.from,
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domain: recipient.split('@')[1],
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subject: bounceEmail.getSubject(),
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diagnosticCode,
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statusCode,
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timestamp: Date.now(),
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headers: {}
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};
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// Process as a regular bounce
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return this.processBounce(bounceData);
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}
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catch (error) {
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logger.log('error', `Error processing bounce email: ${error.message}`);
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return null;
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}
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}
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/**
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* Handle a hard bounce by adding to suppression list
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* @param bounce The bounce record
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*/
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async handleHardBounce(bounce) {
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// Add to suppression list permanently (no expiry)
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this.addToSuppressionList(bounce.recipient, `Hard bounce: ${bounce.bounceType}`, undefined);
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// Increment bounce count in cache
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this.updateBounceCache(bounce);
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// Save to permanent storage
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await this.saveBounceRecord(bounce);
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// Log hard bounce for monitoring
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logger.log('warn', `Hard bounce for ${bounce.recipient}: ${bounce.bounceType}`, {
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domain: bounce.domain,
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smtpResponse: bounce.smtpResponse,
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diagnosticCode: bounce.diagnosticCode
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});
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}
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/**
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* Handle a soft bounce by scheduling a retry if eligible
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* @param bounce The bounce record
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*/
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async handleSoftBounce(bounce) {
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// Check if we've exceeded max retries
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if (bounce.retryCount >= this.retryStrategy.maxRetries) {
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logger.log('warn', `Max retries exceeded for ${bounce.recipient}, treating as hard bounce`);
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// Convert to hard bounce after max retries
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bounce.bounceCategory = BounceCategory.HARD;
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await this.handleHardBounce(bounce);
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return;
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}
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// Calculate next retry time with exponential backoff
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const delay = Math.min(this.retryStrategy.initialDelay * Math.pow(this.retryStrategy.backoffFactor, bounce.retryCount), this.retryStrategy.maxDelay);
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bounce.retryCount++;
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bounce.nextRetryTime = Date.now() + delay;
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// Add to suppression list temporarily (with expiry)
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this.addToSuppressionList(bounce.recipient, `Soft bounce: ${bounce.bounceType}`, bounce.nextRetryTime);
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// Log the retry schedule
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logger.log('info', `Scheduled retry ${bounce.retryCount} for ${bounce.recipient} at ${new Date(bounce.nextRetryTime).toISOString()}`, {
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bounceType: bounce.bounceType,
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retryCount: bounce.retryCount,
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nextRetry: bounce.nextRetryTime
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});
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}
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/**
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* Add an email address to the suppression list
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* @param email Email address to suppress
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* @param reason Reason for suppression
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* @param expiresAt Expiration timestamp (undefined for permanent)
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*/
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addToSuppressionList(email, reason, expiresAt) {
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this.suppressionList.set(email.toLowerCase(), {
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reason,
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timestamp: Date.now(),
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expiresAt
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});
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// Save asynchronously without blocking
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this.saveSuppressionList().catch(error => {
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logger.log('error', `Failed to save suppression list after adding ${email}: ${error.message}`);
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});
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logger.log('info', `Added ${email} to suppression list`, {
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reason,
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expiresAt: expiresAt ? new Date(expiresAt).toISOString() : 'permanent'
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});
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}
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/**
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* Remove an email address from the suppression list
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* @param email Email address to remove
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*/
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removeFromSuppressionList(email) {
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const wasRemoved = this.suppressionList.delete(email.toLowerCase());
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if (wasRemoved) {
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// Save asynchronously without blocking
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this.saveSuppressionList().catch(error => {
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logger.log('error', `Failed to save suppression list after removing ${email}: ${error.message}`);
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});
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logger.log('info', `Removed ${email} from suppression list`);
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}
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}
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/**
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* Check if an email is on the suppression list
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* @param email Email address to check
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* @returns Whether the email is suppressed
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*/
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isEmailSuppressed(email) {
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const lowercaseEmail = email.toLowerCase();
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const suppression = this.suppressionList.get(lowercaseEmail);
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if (!suppression) {
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return false;
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}
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// Check if suppression has expired
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if (suppression.expiresAt && Date.now() > suppression.expiresAt) {
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this.suppressionList.delete(lowercaseEmail);
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// Save asynchronously without blocking
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this.saveSuppressionList().catch(error => {
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logger.log('error', `Failed to save suppression list after expiry cleanup: ${error.message}`);
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});
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return false;
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}
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return true;
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}
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/**
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* Get suppression information for an email
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* @param email Email address to check
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* @returns Suppression information or null if not suppressed
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*/
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getSuppressionInfo(email) {
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const lowercaseEmail = email.toLowerCase();
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const suppression = this.suppressionList.get(lowercaseEmail);
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if (!suppression) {
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return null;
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}
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// Check if suppression has expired
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if (suppression.expiresAt && Date.now() > suppression.expiresAt) {
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this.suppressionList.delete(lowercaseEmail);
|
|
// Save asynchronously without blocking
|
|
this.saveSuppressionList().catch(error => {
|
|
logger.log('error', `Failed to save suppression list after expiry cleanup: ${error.message}`);
|
|
});
|
|
return null;
|
|
}
|
|
return suppression;
|
|
}
|
|
/**
|
|
* Save suppression list to disk
|
|
*/
|
|
async saveSuppressionList() {
|
|
try {
|
|
const suppressionData = JSON.stringify(Array.from(this.suppressionList.entries()));
|
|
if (this.storageManager) {
|
|
// Use storage manager
|
|
await this.storageManager.set('/email/bounces/suppression-list.json', suppressionData);
|
|
}
|
|
else {
|
|
// Fall back to filesystem
|
|
await plugins.smartfs.file(plugins.path.join(paths.dataDir, 'emails', 'suppression_list.json')).write(suppressionData);
|
|
}
|
|
}
|
|
catch (error) {
|
|
logger.log('error', `Failed to save suppression list: ${error.message}`);
|
|
}
|
|
}
|
|
/**
|
|
* Load suppression list from disk
|
|
*/
|
|
async loadSuppressionList() {
|
|
try {
|
|
let entries = null;
|
|
let needsMigration = false;
|
|
if (this.storageManager) {
|
|
// Try to load from storage manager first
|
|
const suppressionData = await this.storageManager.get('/email/bounces/suppression-list.json');
|
|
if (suppressionData) {
|
|
entries = JSON.parse(suppressionData);
|
|
}
|
|
else {
|
|
// Check if data exists in filesystem and migrate
|
|
const suppressionPath = plugins.path.join(paths.dataDir, 'emails', 'suppression_list.json');
|
|
if (plugins.fs.existsSync(suppressionPath)) {
|
|
const data = plugins.fs.readFileSync(suppressionPath, 'utf8');
|
|
entries = JSON.parse(data);
|
|
needsMigration = true;
|
|
logger.log('info', 'Migrating suppression list from filesystem to StorageManager');
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
// No storage manager, use filesystem directly
|
|
const suppressionPath = plugins.path.join(paths.dataDir, 'emails', 'suppression_list.json');
|
|
if (plugins.fs.existsSync(suppressionPath)) {
|
|
const data = plugins.fs.readFileSync(suppressionPath, 'utf8');
|
|
entries = JSON.parse(data);
|
|
}
|
|
}
|
|
if (entries) {
|
|
this.suppressionList = new Map(entries);
|
|
// Clean expired entries
|
|
const now = Date.now();
|
|
let expiredCount = 0;
|
|
for (const [email, info] of this.suppressionList.entries()) {
|
|
if (info.expiresAt && now > info.expiresAt) {
|
|
this.suppressionList.delete(email);
|
|
expiredCount++;
|
|
}
|
|
}
|
|
if (expiredCount > 0 || needsMigration) {
|
|
logger.log('info', `Cleaned ${expiredCount} expired entries from suppression list`);
|
|
await this.saveSuppressionList();
|
|
}
|
|
logger.log('info', `Loaded ${this.suppressionList.size} entries from suppression list`);
|
|
}
|
|
}
|
|
catch (error) {
|
|
logger.log('error', `Failed to load suppression list: ${error.message}`);
|
|
}
|
|
}
|
|
/**
|
|
* Save bounce record to disk
|
|
* @param bounce Bounce record to save
|
|
*/
|
|
async saveBounceRecord(bounce) {
|
|
try {
|
|
const bounceData = JSON.stringify(bounce, null, 2);
|
|
if (this.storageManager) {
|
|
// Use storage manager
|
|
await this.storageManager.set(`/email/bounces/records/${bounce.id}.json`, bounceData);
|
|
}
|
|
else {
|
|
// Fall back to filesystem
|
|
const bouncePath = plugins.path.join(paths.dataDir, 'emails', 'bounces', `${bounce.id}.json`);
|
|
// Ensure directory exists
|
|
const bounceDir = plugins.path.join(paths.dataDir, 'emails', 'bounces');
|
|
await plugins.smartfs.directory(bounceDir).recursive().create();
|
|
await plugins.smartfs.file(bouncePath).write(bounceData);
|
|
}
|
|
}
|
|
catch (error) {
|
|
logger.log('error', `Failed to save bounce record: ${error.message}`);
|
|
}
|
|
}
|
|
/**
|
|
* Update bounce cache with new bounce information
|
|
* @param bounce Bounce record to update cache with
|
|
*/
|
|
updateBounceCache(bounce) {
|
|
const email = bounce.recipient.toLowerCase();
|
|
const existing = this.bounceCache.get(email);
|
|
if (existing) {
|
|
// Update existing cache entry
|
|
existing.lastBounce = bounce.timestamp;
|
|
existing.count++;
|
|
existing.type = bounce.bounceType;
|
|
existing.category = bounce.bounceCategory;
|
|
}
|
|
else {
|
|
// Create new cache entry
|
|
this.bounceCache.set(email, {
|
|
lastBounce: bounce.timestamp,
|
|
count: 1,
|
|
type: bounce.bounceType,
|
|
category: bounce.bounceCategory
|
|
});
|
|
}
|
|
}
|
|
/**
|
|
* Check bounce history for an email address
|
|
* @param email Email address to check
|
|
* @returns Bounce information or null if no bounces
|
|
*/
|
|
getBounceInfo(email) {
|
|
return this.bounceCache.get(email.toLowerCase()) || null;
|
|
}
|
|
/**
|
|
* Analyze SMTP response and diagnostic codes to determine bounce type
|
|
* @param smtpResponse SMTP response string
|
|
* @param diagnosticCode Diagnostic code from bounce
|
|
* @param statusCode Status code from bounce
|
|
* @returns Detected bounce type and category
|
|
*/
|
|
detectBounceType(smtpResponse, diagnosticCode, statusCode) {
|
|
// Combine all text for comprehensive pattern matching
|
|
const fullText = `${smtpResponse} ${diagnosticCode} ${statusCode}`.toLowerCase();
|
|
// Check for auto-responses first
|
|
if (this.matchesPattern(fullText, BounceType.AUTO_RESPONSE) ||
|
|
this.matchesPattern(fullText, BounceType.CHALLENGE_RESPONSE)) {
|
|
return {
|
|
type: BounceType.AUTO_RESPONSE,
|
|
category: BounceCategory.AUTO_RESPONSE
|
|
};
|
|
}
|
|
// Check for hard bounces
|
|
for (const bounceType of [
|
|
BounceType.INVALID_RECIPIENT,
|
|
BounceType.DOMAIN_NOT_FOUND,
|
|
BounceType.MAILBOX_FULL,
|
|
BounceType.MAILBOX_INACTIVE,
|
|
BounceType.BLOCKED,
|
|
BounceType.SPAM_RELATED,
|
|
BounceType.POLICY_RELATED
|
|
]) {
|
|
if (this.matchesPattern(fullText, bounceType)) {
|
|
return {
|
|
type: bounceType,
|
|
category: BounceCategory.HARD
|
|
};
|
|
}
|
|
}
|
|
// Check for soft bounces
|
|
for (const bounceType of [
|
|
BounceType.SERVER_UNAVAILABLE,
|
|
BounceType.TEMPORARY_FAILURE,
|
|
BounceType.QUOTA_EXCEEDED,
|
|
BounceType.NETWORK_ERROR,
|
|
BounceType.TIMEOUT
|
|
]) {
|
|
if (this.matchesPattern(fullText, bounceType)) {
|
|
return {
|
|
type: bounceType,
|
|
category: BounceCategory.SOFT
|
|
};
|
|
}
|
|
}
|
|
// Handle DSN (Delivery Status Notification) status codes
|
|
if (statusCode) {
|
|
// Format: class.subject.detail
|
|
const parts = statusCode.split('.');
|
|
if (parts.length >= 2) {
|
|
const statusClass = parts[0];
|
|
const statusSubject = parts[1];
|
|
// 5.X.X is permanent failure (hard bounce)
|
|
if (statusClass === '5') {
|
|
// Try to determine specific type based on subject
|
|
if (statusSubject === '1') {
|
|
return { type: BounceType.INVALID_RECIPIENT, category: BounceCategory.HARD };
|
|
}
|
|
else if (statusSubject === '2') {
|
|
return { type: BounceType.MAILBOX_FULL, category: BounceCategory.HARD };
|
|
}
|
|
else if (statusSubject === '7') {
|
|
return { type: BounceType.BLOCKED, category: BounceCategory.HARD };
|
|
}
|
|
else {
|
|
return { type: BounceType.UNKNOWN, category: BounceCategory.HARD };
|
|
}
|
|
}
|
|
// 4.X.X is temporary failure (soft bounce)
|
|
if (statusClass === '4') {
|
|
// Try to determine specific type based on subject
|
|
if (statusSubject === '2') {
|
|
return { type: BounceType.QUOTA_EXCEEDED, category: BounceCategory.SOFT };
|
|
}
|
|
else if (statusSubject === '3') {
|
|
return { type: BounceType.SERVER_UNAVAILABLE, category: BounceCategory.SOFT };
|
|
}
|
|
else if (statusSubject === '4') {
|
|
return { type: BounceType.NETWORK_ERROR, category: BounceCategory.SOFT };
|
|
}
|
|
else {
|
|
return { type: BounceType.TEMPORARY_FAILURE, category: BounceCategory.SOFT };
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Default to unknown
|
|
return {
|
|
type: BounceType.UNKNOWN,
|
|
category: BounceCategory.UNKNOWN
|
|
};
|
|
}
|
|
/**
|
|
* Check if text matches any pattern for a bounce type
|
|
* @param text Text to check against patterns
|
|
* @param bounceType Bounce type to get patterns for
|
|
* @returns Whether the text matches any pattern
|
|
*/
|
|
matchesPattern(text, bounceType) {
|
|
const patterns = BOUNCE_PATTERNS[bounceType];
|
|
if (!patterns) {
|
|
return false;
|
|
}
|
|
for (const pattern of patterns) {
|
|
if (pattern.test(text)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
/**
|
|
* Get all known hard bounced addresses
|
|
* @returns Array of hard bounced email addresses
|
|
*/
|
|
getHardBouncedAddresses() {
|
|
const hardBounced = [];
|
|
for (const [email, info] of this.bounceCache.entries()) {
|
|
if (info.category === BounceCategory.HARD) {
|
|
hardBounced.push(email);
|
|
}
|
|
}
|
|
return hardBounced;
|
|
}
|
|
/**
|
|
* Get suppression list
|
|
* @returns Array of suppressed email addresses
|
|
*/
|
|
getSuppressionList() {
|
|
return Array.from(this.suppressionList.keys());
|
|
}
|
|
/**
|
|
* Clear old bounce records (for maintenance)
|
|
* @param olderThan Timestamp to remove records older than
|
|
* @returns Number of records removed
|
|
*/
|
|
clearOldBounceRecords(olderThan) {
|
|
let removed = 0;
|
|
this.bounceStore = this.bounceStore.filter(bounce => {
|
|
if (bounce.timestamp < olderThan) {
|
|
removed++;
|
|
return false;
|
|
}
|
|
return true;
|
|
});
|
|
return removed;
|
|
}
|
|
}
|
|
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