is an open source mail transfer agent
(MTA), a computer program
for the routing and delivery of email
, that is intended as a fast, easy to administer and secure alternative to the widely-used Sendmail
. Formerly known as VMailer
and IBM Secure Mailer
, it was originally written by Wietse Venema during a stay at the IBM T. J. Watson Research, and continues to be developed actively until today.
Postfix is also the default MTA in Trustix Secure Linux and Mac OS X Panther.