Postfix is a mail transfer agent (MTA) that supports LDAP, SMTP AUTH (SASL) and TLS.
Postfix was written by Wietse Venema in 1997 and first released in December 1998 as IBM Secure Mailer.
It was designed to be highly secure and configurable, and is a drop-in replacement for sendmail.
The software was also formerly known as VMailer.
