"I've written about Postfix before, over a year ago, and since
then it has gotten even better. I must confess that I've been using
the 31 Dec. 1999 release on my servers until last week, which,
while extremely stable, lacks a lot of the features now available
in current snapshots of Postfix. Postfix is now more useful than
ever as a gateway mail server. I'll cover some of the more
interesting available features and how you can use them to secure
and protect your email infrastructure. Most of these features are
actually quite old, but are probably news to most users."
"This is probably the best way of restricting incoming email to
valid email accounts only. Let's assume you have a decent-sized
corporate LAN based on Windows and are using Exchange server for
email. Exchange can only validate incoming email based on the
domain, not the user, and since it will attempt to deliver the
email for 48 hours, your system can get quickly clogged up - with
no easy way to clean it out. Place your Exchange server behind a
firewall so no one on the Internet can connect to it directly, and
then place a Postfix server on the public side."
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