Mail::Milter is an object-oriented framework for building "milter" mail
filters for use with Sendmail and some other MTAs. It works as a layer on
top of the Sendmail::Milter or Sendmail::PMilter protocol transport.
0.04 is a major feature update. This release introduces DNSBL support for
connecting hosts and MAIL FROM domains (aka "RHSBLs"), a new module that
rejects many types of forged-virus bounces, and a general regular expression
milter for the HELO string.