[Mailman-Users] Spam filters

[Stephen J. Turnbull]

Mark J Bradakis writes:

 > So my mailing lists are getting hit by spam that goes to the lists
 > since it claims to be from some poor subscriber whose email got
 > hijacked.  But to be more general, what are some of the current
 > best practices to filter out spam in a postfix mailman environment
 > on Linux?

Run SpamAssassin or similar as a milter from Postfix.

One hint that may help is that on many lists there's a short list of
keywords that allow you to whitelist content when they appear in a
text/* part.  Eg, on Python lists, almost no spam contains the word
"python" (except perhaps in the greeting "Dear
python-list at python.com").  SpamAssassin and similar filters allow you
to add rules for this kind of thing.