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ZMailer logo.svg
Original author(s)Rayan S. Zachariassen
Developer(s)Matti E. Aarnio
Initial release1988
Stable release
2.99.57 / June 28, 2007;
12 years ago
Written inC
Operating systemUnix-like
TypeMail transfer agent
LicenseGPL / LGPL / Artistic License

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

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, hosting the various Linux kernel mailing lists.


  1. ^ "ZMailer Overview". Retrieved 2018-09-17.

External links[edit]