refactor: make SMTP configuration configurable via environment variables

index.js

@@ -443,15 +443,15 @@ app.get('/location/:id', async (req, res) => {
 
 // Configure nodemailer with your own server
 const transporter = nodemailer.createTransport({
-    host: 'mail.uplink.tel', // Replace with your SMTP server
-    port: 465, // Replace with your SMTP port (587 is common for TLS)
-    secure: true, // Set to true if using port 465
+    host: process.env.SMTP_HOST || 'mail.uplink.tel',
+    port: parseInt(process.env.SMTP_PORT, 10) || 465,
+    secure: (process.env.SMTP_SECURE || 'true').toLowerCase() === 'true',
     auth: {
         user: process.env.ADMIN_EMAIL, // Admin email
         pass: process.env.EMAIL_PASSWORD // Email password
     },
     tls: {
-        rejectUnauthorized: false // Use this if you encounter certificate issues
+        rejectUnauthorized: (process.env.SMTP_TLS_REJECT_UNAUTHORIZED || 'false').toLowerCase() === 'true' // Default to false for rejectUnauthorized
     }
 });