Issue Emails stuck on queue.

[Rumesh Dananjaya]

Emails receiving, but not sending. Stuck on queue.
This is my maillog.

Jul 26 16:45:30 s19483402 postfix/smtpd[17942]: connect from unknown[103.231.139.130]
Jul 26 16:45:32 s19483402 plesk_saslauthd[17943]: No such user 'mathew@onlinehome-server.com' in mail authorization database
Jul 26 16:45:32 s19483402 plesk_saslauthd[17943]: failed mail authenticatication attempt for user 'mathew@onlinehome-server.com' (password len=10)
Jul 26 16:45:32 s19483402 postfix/smtpd[17938]: warning: unknown[103.231.139.5]: SASL LOGIN authentication failed: authentication failure
Jul 26 16:45:32 s19483402 plesk_saslauthd[17943]: No such user 'radyokaan@s19483402.onlinehome-server.com' in mail authorization database
Jul 26 16:45:32 s19483402 plesk_saslauthd[17943]: failed mail authenticatication attempt for user 'radyokaan@s19483402.onlinehome-server.com' (password len=10)
Jul 26 16:45:32 s19483402 postfix/smtpd[17927]: warning: unknown[185.137.111.200]: SASL LOGIN authentication failed: authentication failure
Jul 26 16:45:33 s19483402 postfix/smtpd[17938]: disconnect from unknown[103.231.139.5]
Jul 26 16:45:34 s19483402 postfix/smtpd[17927]: disconnect from unknown[185.137.111.200]
Jul 26 16:45:34 s19483402 plesk_saslauthd[17943]: No such user 'kokpb@onlinehome-server.com' in mail authorization database
Jul 26 16:45:34 s19483402 plesk_saslauthd[17943]: failed mail authenticatication attempt for user 'kokpb@onlinehome-server.com' (password len=6)
Jul 26 16:45:34 s19483402 postfix/smtpd[17942]: warning: unknown[103.231.139.130]: SASL LOGIN authentication failed: authentication failure
Jul 26 16:45:34 s19483402 postfix/smtpd[17942]: disconnect from unknown[103.231.139.130]

 

[Rumesh Dananjaya]

Need help ASAP

 

[Ales]

There is nothing in the maillog above that would explain why is your outgoing mail stuck.

How many messages are in the queue at the moment? Is such a number of messages normal for your server? Is the number rising, and if it is, at a normal rate or..?

Did you try restarting postfix? Any errors regarding postfix in the logs?

Have any changes been made to the server's configuration recently?