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/delivery/smtpserver/interfaces.ts

@@ -476,16 +476,11 @@ export interface ISmtpServerOptions {
      * Whether authentication is required
      */
     required: boolean;
-
+    
     /**
      * Allowed authentication methods
      */
     methods: ('PLAIN' | 'LOGIN' | 'OAUTH2')[];
-
-    /**
-     * Whether TLS is required for authentication (default: true)
-     */
-    requireTLS?: boolean;
   };
   
   /**