This tutorial shows how to implement SPF (Sender Policy Framework) in
a Postfix 2.x installation. The Sender Policy Framework is an open
standard specifying a technical method to prevent sender address forgery
(see http://www.openspf.org/Introduction).
There are lots of SPF extensions and patches available for Postfix, but
most require that you recompile Postfix. Therefore we will install the...
How To Implement SPF In Postfix
Continue reading How To Implement SPF In Postfix