Unix Mail Transport Systems reviewed by JdeBP

There are various MTSs for Unix. They can be broadly grouped into two categories:

Single, vast, monolithic, set-UID root, binaries:
- smail,
- exim, and
- Sendmail.
Multiple programs, with individual responsibility for separate tasks:
- qmail,
- Postfix,
- MMDF, and
- ZMailer.

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