What is and how to enable SPF?
Posted by Gary Garber, Last modified by Valentin   on 15 July 2014 05:40 AM

SPF

 

WORKAROUND

SPF feature is implemented in Icewarp Mail Server as a part of the SpamAssassin in Icewarp AntiSpam. If you enable SPF it will modify SpamAssassin score for each message.

There are three ways how the message can be evaluated against a SPF record:

  • pass - it means that SPF record fits an IP address or hostname of sending server
  • fail - it means that SPF record does not fit an IP address or hostname of sending server
  • softfail - it means that SPF record of sending server does not exist at all so Icewarp Server was not able to check it

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.

 

 

local

Internet

local + bayesian

Internet + bayesian

pass

- 0.001

- 0.001

- 0.001

- 0.001

fail

+ 5

+ 5

+ 5

+ 5.875

softfail

+ 0.5

+ 0.842

+ 0.5

+ 0.5

 

To enable SPF feature:

  • go to Anti-Spam menu node in Icewarp Administration Console
  • choose SpamAssassin tab sheet
  • enable Use SPF (Sender Policy Framework) option

    SPF

 

Updated 15.07.2014, by Valentin

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