Set and clear timeout for external requests

otherwise, the server crashes for a write after timeout

src/routes/mailserver.js

@@ -43,6 +43,7 @@ function proxy(req, res, next) {
         proxyOptions.rejectUnauthorized = false;
         const mailserverProxy = middleware.proxy(proxyOptions);
 
+        req.clearTimeout(); // TODO: add timeout to mail server proxy logic instead of this
         mailserverProxy(req, res, function (error) {
             if (!error) return next();