feat: change the email structure into seprate module

src/app.module.ts

@@ -18,6 +18,8 @@ import { AiAssistantModule } from "./modules/ai-assistant/ai-assistant.module";
 import { AuthModule } from "./modules/auth/auth.module";
 import { DomainsModule } from "./modules/domains/domains.module";
 import { EmailModule } from "./modules/email/email.module";
+import { EmailGatewayModule } from "./modules/email-gateway/email-gateway.module";
+import { EmailUtilsModule } from "./modules/email-utils/email-utils.module";
 import { MailServerModule } from "./modules/mail-server/mail-server.module";
 import { MailboxModule } from "./modules/mailbox/mailbox.module";
 import { NotificationModule } from "./modules/notifications/notifications.module";
@@ -52,6 +54,8 @@ import { UtilsModule } from "./modules/utils/utils.module";
     SettingModule,
     NotificationModule,
     UploaderModule,
+    EmailUtilsModule,
+    EmailGatewayModule,
   ],
 })
 export class AppModule implements NestModule {