Sendmail

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Sendmail

Original author(s)	Eric Allman
Developer(s)	Sendmail Consortium, Proofpoint, Inc.
Initial release	1983; 41 years ago (1983)
Stable release	8.18.1[1] / January 31, 2024; 6 months ago (2024-01-31)
Operating system	Cross-platform
Type	Mail transfer agent
License	Sendmail License
Website	www.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.