Blocking all attachments

[cecb @ mhv . net]

     I wonder if anyone here can tell me if a listowner
using listserv software can completely block all
email messages which contain attachments.

     There's a mailing list to which I belong which
has ongoing problems with members who continue
to send *very* large attachments (meg or more)
which causes great problems to list subscribers.

      Could the listowner solve the problem by
just bouncing *all* messages to the listserv
with any attachment?

       Inquiring minds would like to know....

Thanks