Sendmail is a general purpose internetworkemail 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.

This article is about the mail transfer agent. For the company, see Sendmail, Inc.
This article includes a list of general references, but it remains largely unverified because it lacks sufficient corresponding inline citations. (November 2019)
Original author(s) Eric Allman
Developer(s) Sendmail Consortium, Proofpoint, Inc.
Initial release 1983; 38 years ago (1983)
Stable release
8.17.1[1] / August 17, 2021; 3 months ago (2021-08-17)
Operating system Cross-platform
Type Mail transfer agent
License Sendmail License

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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Allman had written the original ARPANETdelivermail which shipped in 1979 with 4.0 and 4.1 BSD. He wrote Sendmail as a derivative of delivermail in the early 1980s at UC Berkeley. It shipped with BSD 4.1c in 1983, the first BSD version that included TCP/IP protocols.

In 1996, approximately 80% of the publicly reachable mail-servers on the Internet ran Sendmail.[2] More recent surveys have suggested a decline, with 3.64% of mail servers in March 2021 detected as running Sendmail in a study performed by E-Soft, Inc.[3] A previous survey (December 2007 or earlier) reported 24% of mail servers running Sendmail according to a study performed by Mail Radar.[4]

Allman designed Sendmail to incorporate great flexibility, but it can be daunting to configure for novices.[5] Standard configuration packages delivered with the source code distribution require the use of the M4 macro language which hides much of the configuration complexity. The configuration defines the site-local mail delivery options and their access parameters, the mechanism of forwarding mail to remote sites, as well as many application tuning parameters.

Sendmail supports a variety of mail transfer protocols, including SMTP, DECnet‘s Mail-11, HylaFax, QuickPage and UUCP. Additionally, Sendmail v8.12 as of September 2001[update] introduced support for milters – external mail filtering programs that can participate in each step of the SMTP conversation.

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