Sendmail

This article is about the mail transfer agent. For the company, see Sendmail, Inc.
Sendmail
Original authorEric Allman
DevelopersSendmail Consortium, Proofpoint, Inc.
Initial release1983 (1983)
Stable release
8.18.2 / December 27, 2025 (2025-12-27)
Operating systemCross-platform
Predecessordelivermail
TypeMail transfer agent
LicenseSendmail License
Websitewww.proofpoint.com/us/products/open-source-email-solution

Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.

A descendant of the delivermail program written by Eric Allman, Sendmail is a well-known project of the free and open source software and Unix communities. It has spread both as free software and proprietary software.

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