Unfortunately, with versatility comes complexity. The sendmail program??™s large configuration
file often becomes overwhelming for novice mail administrators to handle. Many
books have been written to assist the mail administrator in determining the proper
configuration file settings for a particular email server application.
qmail
qmail is a complete MTA program written and maintained by Dan Bernstein
(http://www.qmail.org). It supports all of the MTA functionality of the sendmail program.
qmail takes the idea of modular email software one more step; it was written as a set of
modular programs to perform the MTA function. It breaks the MTA functions down into
several modules and uses separate programs to implement each function.
qmail requires several different user ids to be added to the mail server. Each program
module runs under a different user id. If an intruder compromises one module, it most
likely will not affect the other modules. The security features of qmail are often touted as
the best feature of qmail.
Still another feature of qmail is its reliability.
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