[Mailman-Users] Mailman stopped delivering mail

[Eric Evans]

Hello,

I have a perplexing problem and I was hoping someone might be able to give 
me some advice.  I've been running Mailman for several months with no 
problems, and a few days ago Mailman stopped delivering mail for no 
apparent reason.  In Mailman's smtp log file I see messages that say "all 
recipients refused: host/servname not known."  This would seem to imply 
that there is some kind of DNS hostname resolution problem, but none of the 
other applications running on this server have a problem with hostname 
resolution.

I've checked all the standard Mailman configuration details that are 
mentioned in the FAQ, i.e. I've made sure that cron is running, that the 
aliases are set up properly, that the mm_cfg.py has the SMTPHOST defined 
properly, that qrunner is running, that there are no errant lock files 
present, and that there are no malformed email messages clogging up the queue.

We're running Mailman 2.1.2 on Solaris 8, with sendmail as the 
MTA.  Mailman was compiled from the source.  We have not upgraded Mailman 
recently or changed its configuration in any way.

I've reached a standstill in my troubleshooting efforts, so if anyone has 
any suggestions for how I could proceed further, I'd appreciate hearing 
them.  Thank you very much.

Eric