From: Jorey Bump (listjoreybump.com)
Date: Tue Apr 01 2008 - 08:23:06 CDT

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Carlos Williams wrote, at 04/01/2008 08:54 AM:
> I am running Postfix 2.3 as a corporate email server. I love running
> Postfix and don't want to switch to something else however SPAM is
> getting way out of control on my companies domain.

The amount of spam you get is unrelated to which MTA you are running.
Merely switching MTAs will not improve the situation. MTAs are
principally designed to transport mail safely, so refusing messages to
valid recipients usually requires extra effort.

[snip]

> Does anyone have a complete guide or anything they recommend? I have
> read Postfix.org <http://Postfix.org> and there are so many different
> manuals and all of them seem to do things their own way. I just want one
> that works. At this point the company I work for would even wire a
> consultant to come out to Orlando and help us get this running.

Fighting spam effectively requires a multilayered approach. There are
many opportunities along the path to identify unwanted messages, and the
  techniques differ accordingly. Some are external to the MTA, some are
builtin, and some use provided hooks. As a first step, you should
provide the output of postconf -n, and let experienced members of the
list provide tips for optimizing your configuration. A few select
builtins, expressions, and RBLs could have an immediate and dramatic
impact on the amount of spam you accept for delivery, and can be
important in reducing the amount of resources you need to apply to more
complex solutions like content inspection and virus filtering.

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