[Gllug] Configuring SPF to cope with secondary incoming mail servers

[Jason Clifford]

On Mon, 4 Dec 2006, Karanbir Singh wrote:

> why bother testing when most of the spam comes from domains that dont 
> publish a spf record ?

That's rather akin to asking why anyone who want to whitelist known 
senders. 

SPF has the potential to indicate whether a message really did originate 
from the domain it purports to come from. Suitably combined with other 
metrics it can help to reduce spam and the problems of joe jobbing.

> > Having no SPF record simply means the domain registrant/hostmaster either 
> > doesn't know or care about SPF.
> 
> on one mail system I admin, we get between 2.4 - 2.6 Millions emails a 
> day, enabling SPF achieves a net result that does not even translate to 
> a complete percentage in discarded emails.[1]

Who ever said that on it's own it was a solution?

Have you measured the specific value on it's own of every sa rule you 
implement (or equivilent)?

Jason
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