[Mailman-Users] strange postings to non-existant lists

[Stephen J. Turnbull]

Bruce Harrison writes:

 > Mine are almost always mail to invalid lists.

What makes you think these are "lists"?  Simply the fact that they're
addressed to the Mailman machine?  Or are they decommissioned lists or
something like that?  In general, spammers often seem to pick random
mailboxes or common ones (like "webmaster"), or ones that appear on
websites.  A computer users' group once posted "Our meeting will be
held in the seminar room at sponsor.com" (the familiar name of the
company, like Amazon.com), and sure enough, a couple of spams to
"room at sponsor.com" were received.

For spam filtering, besides SpamAssassin, many Mailman lists use
SpamBayes.  (SpamAssassin is the most popular, but SpamBayes uses a
somewhat different approach, so might catch spam that SpamAssassin
doesn't.)