SPAM filtering (was Re: Where would you like to go today?)

[Adam Myrow]

I am currently using the spambouncer filter.  It can be found at
http://www.spambouncer.org.  It requires a little setup initially, but it
does a very good job.  It is regularly updated as well.  although the
documentation describes it as running on your ISP's server assuming you
have shell access, it works just fine with Linux and fetchmail retrieving
mail.  Basically, it classifies mail as personal, bulk, blocked, or spam.
Personal goes to your inbox, bulk is legitimate mailing lists, and unless
modified, goes to a folder called bulk.incoming.  Blocked mail is usually
suspicious mail, but the filter isn't 100% sure of it being spam.  Spam is
what the filter is sure is really spam, and can be safely sent to
/dev/null unless you wish to complain about it.  The neat thing about this
filter is that some of its rules are designed to catch spammers putting
garbage in the subject, or using other tricks to hide from filters.  It's
also very configurable, letting you decide how paranoid it should be.