[CentOS] postfix tightening

On Fri, 2005-04-01 at 20:19 -0600, Mark A. Lewis wrote:
> I have never understood the precived connection between reverse DNS
> and
> spam. I have seen some go as far as if the reverse DNS does not match
> the senders domain they will kick it.

Mostly because a trojaned machine on a broadband connection spewing SPAM
will not have a valid reverse DNS entry.

By forcing a policy of accurate reverse DNS, most of the home-broadband-
SPAM factories are shut down. 

Most ISPs will reject mail if the DNS doesn't reverse correctly, AOL
being one of the largest.