I no longer recommend
(versions 1.03 or earlier) for general use as a Mail Transport Agent (MTA).
I believe it remains an excellent choice for many specific uses.
Though the architecture, design, and codebase of
are of high quality, the quality of the release cycle, support, licensing, and
documentation are not sufficient to make
for general use on the Internet.
In practice, an experienced network administrator can make good
use of the vast amount of information and support available on the Internet
itself to make
qmail among the top choices for an MTA.
Add-on patches, almost always needed, are widely available, and some of them
are of adequate quality; free support is typically offered in response to
thoughtfully presented questions; and third-party on-line documentation exists
of sufficient quality to make internal installation and support feasible.
qmail's architecture is well-designed for
rock-solid internal security. Bugs found in its code that would,
in most any other network-based server requiring privileged access to
a system's internals, be easily exploited, are prevented from doing
so by design in
See my writeup on Guninski's discoveries
for further discussion.
(Kyle Wheeler's book, Qmail Quickstarter, is a helpful guide to getting up to speed on understanding, installing, and making good use of qmail.)
I used to publish several popular
qmail; I no longer
do so, though they are occasionally requested in private and public forums
and available on web sites that archive old versions of this web site.
Most of them appear to be widely used.
qmail.org site, which used to host
netqmail, is defunct.
Check out other resources
available that might be suitable replacements.
Copyright (C) 2005 James Craig Burley, Software Craftsperson
Last modified on 2019-11-08.