[Mailman-Users] Problem with GID

[Dan Mick]

> I have this problem where people can't send messages to the mailing
> lists from the machine that is running mailman.  I set the setgid bit
> and the right group and everything, but whenever some one mails the list
> it says
> 
> ----- Transcript of session follows -----
> Failure to exec script. WANTED gid 1, GOT gid 45.  (Reconfigure to take
> 45?)
> 554 "|/home/mailman/mail/wrapper post blah"... unknown mailer error 2
> 
> Where 45 is whatever the users GID happens to be when he is sending the
> mail.
> Does the setguid bit not work in mailman?

How exactly are the users trying to mail from that machine?
What MTA are you running?
Does the '45' really change from user to user?