Bleh. Ok, I've taken care of this. bestserv will now ignore any
email From: mailer-daemon@ (aka spammers who use our list addresses
as their From:). I'll add others if they come up.
I think I have a solution to catch the mime-encoded spam, but allow
list users to still post mime-encoded files. I haven't implemented it
yet but I think the solution is to simply require that people who post
mime-encoded stuff include a special header with a password. The
password won't be secret or anything, we would publish it on our site,
but spambots aren't going to bother generating it so we would be
protected :-).
-Matt