Refactor email handling to enhance SMTP configuration and error logging

- Updated the email transporter initialization to support secure connections and dynamic port settings.
- Added authentication handling for SMTP credentials if provided.
- Improved error logging during SMTP verification to include detailed connection information.
- Adjusted the sendEmail function signature for consistency with updated parameters.

src/utils/email-handler.ts

@@ -24,21 +24,47 @@ let transporter: nodemailer.Transporter;
 // Initialize the transporter based on environment
 function initializeTransporter() {
   if (isProduction && SMTP_HOST) {
-    // Use local Postfix mail relay (no authentication)
-    transporter = nodemailer.createTransport({
-      host: SMTP_HOST,
-      port: parseInt(SMTP_PORT, 10) || 25, // default to port 25 if not set
-      secure: false, // No SSL for local relay
-      tls: {
-        rejectUnauthorized: false, // Accept self-signed certificates if present
-      },
-    });
+    const port = parseInt(SMTP_PORT, 10) || 587;
+    // Determine if secure connection (port 465 typically uses SSL)
+    const secure = port === 465;
     
-    transporter.verify((error, success) => {
+    // Build transporter config
+    const transporterConfig: {
+      host: string;
+      port: number;
+      secure: boolean;
+      tls: { rejectUnauthorized: boolean };
+      auth?: { user: string; pass: string };
+    } = {
+      host: SMTP_HOST,
+      port: port,
+      secure: secure,
+      tls: {
+        rejectUnauthorized: false, // Accept self-signed certificates (useful for Mailcow)
+      },
+    };
+
+    // Add authentication if credentials are provided
+    if (SMTP_USER && SMTP_PASS) {
+      transporterConfig.auth = {
+        user: SMTP_USER,
+        pass: SMTP_PASS,
+      };
+    }
+
+    transporter = nodemailer.createTransport(transporterConfig);
+
+    transporter.verify((error, _success) => {
       if (error) {
-        console.error('❌ SMTP connection error:', error);
+        console.error('❌ SMTP connection error:', error.message);
+        console.error('   Host:', SMTP_HOST);
+        console.error('   Port:', port);
+        console.error('   Auth:', SMTP_USER ? 'Yes' : 'No');
       } else {
         console.log('✅ SMTP server is ready to take messages.');
+        console.log('   Host:', SMTP_HOST);
+        console.log('   Port:', port);
+        console.log('   Auth:', SMTP_USER ? 'Yes' : 'No');
       }
     });
   } else {
@@ -140,7 +166,7 @@ export function logEmailAttempt(success: boolean, recipient: string, subject: st
 }
 
 // Send an email
-export async function sendEmail(to: string, subject: string, html: string, text: string, domain?: string): Promise<boolean> {
+export async function sendEmail(to: string, subject: string, html: string, text: string, _domain?: string): Promise<boolean> {
   // Initialize transporter if not already done
   if (!transporter) {
     initializeTransporter();