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

[Jason Clifford]

On Mon, 4 Dec 2006, Bruce Richardson wrote:

> Do they claim that in the From: header?  Because that's irrelevant to
> SPF.  What is the envelope sender?

SPF does not itself look anywhere in the message. SPF is just a DNS record 
that you can check against and it's up to whatever glue you use in your 
filtering process as to which data points on the message are checked 
against it.

Certainly the envelope sender *should* be checked but it may also be worth 
checking the From header so long as you understand that neither on it's 
own is sufficient to reject a message.

Jason
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