" Postfix is fast out of the box, but like other packages, you
can usually tune it to work even faster. Furthermore, there are
situations where Postfix may not perform as well as you expected,
whether because of hardware or software limitations on the server
system or other adverse conditions, such as a big influx of spam or
undeliverable mail. This article shows you how to find and analyze
the most common performance problems.
"We will first look at a few elementary tweaks that still may
not be terribly obvious. Think of the suggestions here as a
checklist for solving or avoiding simple problems..."