feat(storage): add comprehensive tests for StorageManager with memory, filesystem, and custom function backends

feat(email): implement EmailSendJob class for robust email delivery with retry logic and MX record resolution

feat(mail): restructure mail module exports for simplified access to core and delivery functionalities

ts/mail/routing/classes.dns.manager.ts

@@ -1,7 +1,7 @@
 import * as plugins from '../../plugins.ts';
 import type { IEmailDomainConfig } from './interfaces.ts';
 import { logger } from '../../logger.ts';
-import type { DcRouter } from '../../classes.mailer.ts';
+import type { DcRouter } from '../../classes.dcrouter.ts';
 import type { StorageManager } from '../../storage/index.ts';
 
 /**

ts/mail/routing/classes.dnsmanager.ts

@@ -416,7 +416,7 @@ export class DNSManager {
    */
   public async saveDnsRecommendations(domain: string, records: IDnsRecord[]): Promise<void> {
     try {
-      const filePath = plugins.path.join(paths.dnsRecordsDir, `${domain}.recommendations.tson`);
+      const filePath = plugins.path.join(paths.dnsRecordsDir, `${domain}.recommendations.json`);
       plugins.smartfile.memory.toFsSync(JSON.stringify(records, null, 2), filePath);
       console.log(`DNS recommendations for ${domain} saved to ${filePath}`);
     } catch (error) {

ts/mail/routing/classes.email.router.ts

@@ -1,11 +1,12 @@
 import * as plugins from '../../plugins.ts';
+import { EventEmitter } from 'node:events';
 import type { IEmailRoute, IEmailMatch, IEmailAction, IEmailContext } from './interfaces.ts';
 import type { Email } from '../core/classes.email.ts';
 
 /**
  * Email router that evaluates routes and determines actions
  */
-export class EmailRouter extends plugins.EventEmitter {
+export class EmailRouter extends EventEmitter {
   private routes: IEmailRoute[];
   private patternCache: Map<string, boolean> = new Map();
   private storageManager?: any; // StorageManager instance
@@ -407,7 +408,7 @@ export class EmailRouter extends plugins.EventEmitter {
       }
       
       const routesData = JSON.stringify(this.routes, null, 2);
-      await this.storageManager.set('/email/routes/config.tson', routesData);
+      await this.storageManager.set('/email/routes/config.json', routesData);
       
       this.emit('routesPersisted', this.routes.length);
     } catch (error) {
@@ -430,7 +431,7 @@ export class EmailRouter extends plugins.EventEmitter {
     }
     
     try {
-      const routesData = await this.storageManager.get('/email/routes/config.tson');
+      const routesData = await this.storageManager.get('/email/routes/config.json');
       
       if (!routesData) {
         return [];

ts/mail/routing/classes.unified.email.server.ts

@@ -1,5 +1,6 @@
 import * as plugins from '../../plugins.ts';
 import * as paths from '../../paths.ts';
+import { EventEmitter } from 'events';
 import { logger } from '../../logger.ts';
 import { 
   SecurityLogger, 
@@ -28,7 +29,7 @@ import { UnifiedDeliveryQueue, type IQueueOptions } from '../delivery/classes.de
 import { UnifiedRateLimiter, type IHierarchicalRateLimits } from '../delivery/classes.unified.rate.limiter.ts';
 import { SmtpState } from '../delivery/interfaces.ts';
 import type { EmailProcessingMode, ISmtpSession as IBaseSmtpSession } from '../delivery/interfaces.ts';
-import type { DcRouter } from '../../classes.mailer.ts';
+import type { DcRouter } from '../../classes.dcrouter.ts';
 
 /**
  * Extended SMTP session interface with route information
@@ -153,7 +154,7 @@ export interface IServerStats {
 /**
  * Unified email server that handles all email traffic with pattern-based routing
  */
-export class UnifiedEmailServer extends plugins.EventEmitter {
+export class UnifiedEmailServer extends EventEmitter {
   private dcRouter: DcRouter;
   private options: IUnifiedEmailServerOptions;
   private emailRouter: EmailRouter;