SMTP::Server

SMTP::Server is a complete RFC 821 compliant mail server, written entirely in Perl. It's extremely extensible, and can easily be adapted to do things like SPAM/RBL filtering, and it's portable to all major platforms, including Win32. The SMTP::Server architecture was written to be very flexible, and its true power comes from the ability to extend/customize its functionality with plugin modules, or Perl code.