I am having trouble with one of my sendmail servers. Users are informing me about that registration emails do not arrive. The logfile claims that the message has been queued, but the queue is empty:
sudo cat /var/log/mail.log | grep email
(with obfuscated e-mail and server adresses in this example):
Jan 6 23:33:57 fx1 sendmail[9292]: u06MXvuk009292: to=email, ctladdr=sender-email (1001/100), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=38128, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (u06MXv7o009293 Message accepted for delivery)
Jan 6 23:34:00 fx1 sm-mta[9295]: u06MXv7o009293: to=, delay=00:00:03, xdelay=00:00:03, mailer=esmtp, pri=128308, relay=mx3.hotmail.com. [65.55.37.120], dsn=2.0.0, stat=Sent ( <70001a6bb8ff80254895632a2c4367fb@myhost> Queued mail for delivery)
$ mailq
> MSP Queue status...
/var/spool/mqueue-client is empty
Total requests: 0
MTA Queue status...
/var/spool/mqueue (1 request)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
u04ALref018750* 184 Mon Jan 4 11:21 <services@globosapiens.net>
(Deferred: Connection timed out with mail.vtmail.com.)
<nicolaitan@vtmail.com>
Total requests: 1
The mail.err logfile is empty.
How could I track down the problem? This is happening quite frequently.