Posted by on 01 August 2012 02:10 PM
If you want to know what SPF is in general, look here.
SPF feature is implemented in Icewarp Mail Server as a part of the SpamAssassin feature in Icewarp Instant Anti Spam. If you enable the SPF feature it will modify SpamAssassin score for each message.
There are three ways how the message can be evaluated against a SPF record:
SpamAssassin score modification also depends on the sending server location (either local address or address from Internet) and if Include Bayesian probability in SpamAssassin score (bayesian in table below) option is enabled.
To enable SPF feature: