ZMailer is a SMTP

mail transfer agent The mail or post is a system for physically transporting postcards, letter (message), letters, and parcel (package), parcels. A postal service can be private or public, though many governments place restrictions on private systems. Since the mid ...

for

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which i ...

BSD The Berkeley Software Distribution or Berkeley Standard Distribution (BSD) is a discontinued operating system based on Research Unix, developed and distributed by the Computer Systems Research Group (CSRG) at the University of California, Be ...

and other

Unix-like A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, although not necessarily conforming to or being certified to any version of the Single UNIX Specification. A Unix-li ...

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 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 ...

, by Rayan S. Zachariassen at the

University of Toronto The University of Toronto (UToronto or U of T) is a public research university in Toronto, Ontario, Canada, located on the grounds that surround Queen's Park. It was founded by royal charter in 1827 as King's College, the first institu ...

. 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 A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whe ...

, SPF, and message content scanning. One site of note utilizing ZMailer is vger.kernel.org, hosting the various

Linux kernel The Linux kernel is a free and open-source, monolithic, modular, multitasking, Unix-like operating system kernel. It was originally authored in 1991 by Linus Torvalds for his i386-based PC, and it was soon adopted as the kernel for the GNU ...

mailing lists.

References

External links

Zmscanner
input filter for synchronous SMTP input message scanning with many mechanisms, including ClamAV antivirus.
Zmscanner additional modules

Dovecot LDA as local delivery agent for ZMailer
Message transfer agents {{network-software-stub