mailer: set timeouts

src/mailer.js

@@ -67,6 +67,9 @@ async function sendMail(mailOptions) {
             user: mailOptions.authUser || `no-reply@${dashboardDomain}`,
             pass: data.relayToken
         },
+        connectionTimeout: 3000,
+        greetingTimeout: 3000,
+        socketTimeout: 3000,
         logger: false,
         debug: false // set to true for smtp logs
     });