>     CE> Is there a way to reject postings with attachments?
>     CE> This is starting to get to be a problem.  I know
>     CE> I can limit message size, this isn't really the 
>     CE> problem as much as people including non-text
>     CE> items like pictures and word files. 
> 
> Sanjay posted his approach, which is probably the best you can do for
> now without hacking the code.  An idea we threw around last year was
> to have configurable filters the message could pass through.  One such 
> filter could either strip or reject attachments, similar to what you
> describe.

Another option for the time being involves wrapping your aliases 
with a filter like procmail.  This is what I do for my majordomo 
lists or any place that I need extra filtering (note the majordomo
slant of these recipes, but I've converted stuff enough here so
that it should apply to Mailman...)  And yes, it's a hack.  :)

   listname         :"|/usr/bin/procmail -m LIST='listname' EXTRA='' /etc/mail/procmailrc.lists"
   listname-admin   :"|/home/staff/mailman/mail/wrapper mailowner listname"
   listname-request :"|/home/staff/mailman/mail/wrapper mailcmd listname"
   owner-listname   :listname-admin
   listname-owner   :listname-admin

/etc/mail/procmailrc.lists looks like this:

   PATH=/usr/bin:/usr/local/bin:/bin
   HOME=/etc/mail

   # if EXTRA isn't set to an archiver or something, set to devnull
   # so that we have another address to hide the -outgoing address
   # in the Received: headers -- another ugly majordomo-required
   # hack
   :0
   * EXTRA ?? ^^^^
   { EXTRA="devnull" }

   # check against message-id database to make sure that this isn't
   # a duplicate post
   :0 Wh: $HOME/list-cache/${LIST}.lock
   | formail -D 8192 $HOME/list-cache/${LIST}.cache

   # mail people to let them know that I don't like attachments
   # on the list
   :0
   * ^(Content-Type: multipart/mixed;|X-MS-Attachment: WINMAIL.DAT)
   * ! ^FROM_DAEMON
   * ! $ ^X-Listname: ${LIST}@mallorn.com
   {
      :0 hc
      | (formail -r -A"Precedence: bulk" \
         -A"X-Listname: ${LIST}@mallorn.com" \
         -A"From: owner-${LIST}@mallorn.com" ;\
          cat "/usr/lib/mail/reply.mime" | sed s/LISTNAME/${LIST}/) | $SENDMAIL -t -f owner-${LIST}@mallorn.com
   }

   :0
   | /home/staff/mailman/mail/wrapper post $LIST,$EXTRA

Chris