What is "postfix"

Postfix \Post"fix\, n.; pl. Postfixes. [Pref. post- + -fix, as in prefix: cf. F. postfixe.] (Gram.) A letter, syllable, or word, added to the end of another word; a suffix.
--Parkhurst.

Postfix \Post*fix"\, v. t. To annex; specifically (Gram.), to add or annex, as a letter, syllable, or word, to the end of another or principal word; to suffix.
--Parkhurst.

n. suffix. vb. 1 (context transitive English) To suffix. 2 (context biology English) To subject a sample to postfixation

n. an affix that is added at the end of the word [syn: suffix]

Postfix may refer to:

• Postfix (linguistics), another word for suffix
• Postfix notation, a way of writing algebraic and other expressions. Also known as reverse Polish notation
• Postfix (software), a mail transfer agent (MTA) program

Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail, intended as an alternative to Sendmail MTA.

Postfix is released under the IBM Public License 1.0 which is a free software license.

Originally written in 1997 by Wietse Venema at the IBM Thomas J. Watson Research Center and first released in December 1998, Postfix continues to be actively developed by its creator and other contributors. The software is also known by its former names VMailer and IBM Secure Mailer.

In April 2016 in a study performed by E-Soft, Inc., approximately 32% of the publicly reachable mail-servers on the Internet ran Postfix.