Update mail.ts

server/mail/mail.ts

@@ -10,10 +10,10 @@ const mailConfig = {
   host: env.MAIL_HOST,
   port: env.MAIL_PORT,
   secure: env.MAIL_SECURE,
-  auth: {
+  auth: env.MAIL_USER ? {
     user: env.MAIL_USER,
     pass: env.MAIL_PASSWORD
-  }
+  } : undefined
 };
 
 const transporter = nodemailer.createTransport(mailConfig);