qmail

qmail
Original authorDaniel J. Bernstein
Final release
1.03 / June 15, 1998 (1998-06-15)
Written inC
Operating systemUnix-like
TypeMail transfer agent
Licensepublic domain
Websitecr.yp.to/qmail.html
Repositorycr.yp.to/software/qmail-1.03.tar.gz
netqmail
Final release
1.06 / November 30, 2007 (2007-11-30)
Websitenetqmail.org
Repositorynetqmail.org/netqmail-1.06.tar.gz
s/qmail
Stable release
4.3.23 / September 11, 2025 (2025-09-11)
Websitefehcom.de/sqmail/sqmail.html
notqmail
Stable release
1.09 / May 6, 2024 (2024-05-06)
Websitenotqmail.org
Repositorygithub.com/notqmail/notqmail
indimail-mta
Stable release
3.0.9 / December 24, 2024 (2024-12-24)
Websitegithub.com/indimail/indimail-mta/wiki/0-IndiMail-Wiki
Repositorygithub.com/indimail
qmail-sagredo
Stable release
2025.09.08 / September 8, 2025 (2025-09-08)
Websitesagredo.eu
Repositorygithub.com/sagredo-dev/qmail

qmail is a mail transfer agent (MTA) that runs on Unix. It was written, starting December 1995, by Daniel J. Bernstein as a more secure alternative to the popular Sendmail program. Originally license-free software, qmail's source code was later dedicated to the public domain by the author.