Jason Long <jlong@messiah.edu>

Uses code from smtpprox:
  http://bent.latency.net/smtpprox/
  Bennett Todd <bet@rahul.net>

and code from Mail::DomainKeys:
  http://killa.net/infosec/Mail-DomainKeys/
  Anthony D. Urso <anthonyu@cpan.org>