update

ts/mail/services/classes.emailservice.ts

@@ -201,9 +201,11 @@ export class EmailService {
         this.config.ports.map(p => p + 10000) : // Use internal ports (10025, etc.)
         this.config.ports; // Use standard ports (25, etc.)
       
-      this.unifiedEmailServer = new UnifiedEmailServer({
+      // Pass null as dcRouter since this is a standalone service
+      this.unifiedEmailServer = new UnifiedEmailServer(null as any, {
         ports: emailPorts,
         hostname: this.config.hostname || 'localhost',
+        domains: [this.config.hostname || 'localhost'], // Default to hostname
         auth: this.config.auth,
         tls: this.config.tls,
         maxMessageSize: this.config.maxMessageSize,