[Mailman-Users] mailman suddenly eats mails

[Alexander Bochmann]

Hi,

we have here a mailman installation that used to work 
without problems, but since a few days, it doesn't 
deliver any mails. Also, there are no error messages 
whatsoever in mailman's log files, so I don't have the 
slightest idea what could be wrong (I'm not the only 
admin on that machine, so maybe someone has changed 
something, but no one would admit to it).

All I can see is that the mail is piped into the mailman 
wrapper, and absolutely nothing happens after that - nothing 
in the mailman logs, and nothing anywhere else:

Mar 25 15:12:40 mailman sendmail[19315]: PAA19314: to="|/data/mailman/mail/wrapper post test2", delay=00:00:01, xdelay=00:00:00, mailer=prog, stat=Sent

Mailman _can_ send mails, though - when I subscribe a 
user via the web interface, he gets the confirmation 
message.

How can I do some debugging on the mailman setup to 
possibly find out where the mails end up? 

System is a Debian Linux with sendmail 8.9.3, 
python 2.1.1 and mailman 2.0.8

Alex.