[Mailman-Users] Problem with GID

[Jacob Brown]

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?

Thanks,
Jacob Brown