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In this chapter we show you how to obtain
the latest version of sendmail in source form,
then how to tune, build, and install it yourself.
Although this process can be simple, many decisions that can complicate it
must be made ahead of time (including the decision of whether or not to
use sendmail in the first place). The sendmail program is not the only MTA on the block. Others have existed
for some time, and new MTAs appear on the scene every once in a while.
We describe a few of the major MTAs and contrast them to
sendmail in the following list:
[1] - Smail3.x
Sites may wish to consider Smail3.x if they
are currently running a complex UUCP connection topology and wish to remain
well connected to UUCP while simultaneously accessing the Internet
with SMTP. One difference between Smail3.x and sendmail
lies in their differing philosophies for parsing addresses. The Smail3.x authors
feel that Internet and UUCP addresses are sufficiently standardized that all parsing can be handled by code rather than by configuration
rules. If you suspect that Smail3.x may be better for your
particular needs, you can get source and documentation from uunet.
Look for a file named something like smail-3.*.tar.Z. - Zmailer
More modular than sendmail, zmailer was written by
Rayan Zachariassen
at a time when sendmail appeared to have been
abandoned. Zmailer is modularized by role, with well-defined
roles. All decisions are made in configuration files; none are made in code.
It tends to be slower than sendmail, but some claim that it is easier
to understand. For additional information, contact: ftp://ftp.cs.toronto.edu/pub/zmailer
- post-office
A commercial offering (new and not widely ported). For those who absolutely
need commercial support, this may be the answer. It features configuration
via email and http forms. Similar to Zmailer, it is modular,
each module playing a well defined role. For additional information, contact: http://www.software.com
Many other MTAs exist, some good and some not so good. We mention only
three here because, after all, this is a book about sendmail.
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