ZMailer

ZMailer is a discontinued SMTP mail transfer agent for Linux, BSD and other Unix-like systems.

ZMailer

Original author(s)	Rayan S. Zachariassen
Developer(s)	Matti E. Aarnio
Initial release	1988
Stable release	2.99.57 / June 28, 2007; 17 years ago (2007-06-28)
Repository	git.linux-mips.org/cgit/ralf/zmailer.git/
Written in	C
Operating system	Unix-like
Type	Mail transfer agent
License	GPL / LGPL / Artistic License
Website	www.zmailer.org

It is intended for gateways or mail servers or other large site environments that have extreme demands on the abilities of the mailer.

It was first developed in 1988, in reaction to the then existing problems with Sendmail,^[1] by Rayan S. Zachariassen at the University of Toronto. The lead developer, since at least 1994, is Matti E. Aarnio.

While official releases have recently been infrequent, regular development and bug-fixes occur in CVS.

ZMailer supports all the modern features expected in a MTA including DNSBL, SPF, and message content scanning.

One site of note utilizing ZMailer is vger.kernel.org, hosting the various Linux kernel mailing lists.