I have an urgent problem. My server can no longer get mail delivered. I've looked in the postfix mail log (/var/log/mail.log) and see gobs upon gobs of errors like this one:
Code:
Feb 29 20:41:33 ip-10-239-138-208 postfix/pickup[27765]: 5836B629E: uid=33 from=<www-data>
Feb 29 20:41:33 ip-10-239-138-208 postfix/cleanup[26956]: 5836B629E: message-id=<cd096258d2b243209882aad90ea5223f@www.mydomain.com>
Feb 29 20:41:33 ip-10-239-138-208 postfix/qmgr[1170]: 5836B629E: from=<noreply@mydomain.com>, size=789, nrcpt=1 (queue active)
Feb 29 20:41:33 ip-10-239-138-208 postfix/error[27917]: 5836B629E: to=<breestuart@example.com>, relay=none, delay=0.02, delays=0.01/0/0/0.01, dsn=4.3.0, status=deferred (unknown mail transport error)
I googled around a bit for the 'unknown mail transport error' message and how I might resolve it and came across
this page which suggests that one use this command to try and find out the issue:
Code:
sudo egrep '(warning|fatal|panic):' /var/log/mail.log | less
That command yields many lines, the first few of which are this
Code:
Feb 28 06:57:31 ip-10-239-138-208 postfix/smtpd[17655]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Feb 28 06:57:33 ip-10-239-138-208 postfix/qmgr[1170]: warning: private/smtp socket: malformed response
Feb 28 06:57:33 ip-10-239-138-208 postfix/qmgr[1170]: warning: transport smtp failure -- see a previous warning/fatal/panic logfile record for the problem description
Feb 28 06:57:33 ip-10-239-138-208 postfix/master[1163]: warning: process /usr/lib/postfix/smtp pid 17659 killed by signal 11
Feb 28 06:57:33 ip-10-239-138-208 postfix/master[1163]: warning: /usr/lib/postfix/smtp: bad command startup -- throttling
Feb 28 06:58:34 ip-10-239-138-208 postfix/master[1163]: warning: process /usr/lib/postfix/smtp pid 17701 killed by signal 11
Feb 28 06:58:34 ip-10-239-138-208 postfix/master[1163]: warning: /usr/lib/postfix/smtp: bad command startup -- throttling
I don't see any fatal or panic messages in this output and am wondering what might be the problem on my server. Any advice would be much appreciated.