imap.fetch is not firing end event and it causes no mail event for new emails

[PoonamGupta212]

I am trying to implement, email notifier for outlook IMAP. As soon as the IMAP server receives an email, my nodejs code need to process that.

This is how I am listening to mail event.

imap.openBox('INBOX', false, function (err, box) {
if (err) {
console.log("Error oppening inbox");
} else {
imap.on('mail', function (numNewMsgs) {
console.log("messages has arrived");
fetchMessages(imap);
});
}
});

// This is the code to fetch new email which is unseen and has recent flag
function fetchMessages(imap) {

var query = imap.search(['UNSEEN', 'RECENT'], function (error, results) {
if (error) { console.log("ERROR imap.search"); throw err; }

  if (results.length <= 0) return;

  var fetchQuery = imap.fetch(results, { bodies: '', markSeen: true });

  fetchQuery.on('message', function (msg, seqno) {
     // parseMessage(msg, seqno);
     console.log('New mail received.');

     var uid, flags;

     msg.once('attributes', function (attrs) {
        uid = attrs.uid;
        flags = attrs.flags;
     });

     var mp = new MailParser();
     mp.once('end', function (mail) {
        mail.uid = uid;
        mail.flags = flags;
        console.log("new email from mail parser");
        //self.emit('mail', mail);
        //self.dbg('found mail '+mail.headers["message-id"]);
     });

     msg.on('body', function (stream, info) {
        stream.pipe(mp);
     });

     msg.once('end', function () {
        // console.log(prefix + 'Finished');
     });
  });

  fetchQuery.once('error', function (err) {
     console.log('Fetch error: ' + err);
  });

  fetchQuery.once('end', function () {
     console.log('Done fetching all messages');
     imap.end();
  });

});
}

My problem is, the first time when I start my node js server, I am able to receive the "mail" event, but after that, I see I don't get any mail notification. It requires me to restart the node js server.

Based on my speculation I found, fetch query "end" event never gets fired.

I tried IMAP.seq.fetch query example from the git hub which works fine, I see end event, but here with imap.fetch I don't get end event.

Note: I am testing this on Outlook IMAP. (Gmail IMAP is working fine for me.)
Please let me know what I am doing wrong. Thanks in advance.