SPF settings with strict enforcement for those domains generally works - 
provided those domains publish SPF records. Settings that can be used are:

SPF2 - Check
SPFWL - Check
strictSPFRe - list domains that should always be forced to pass SPF checks.

and optionally:
blockstrictSPFRe - list those same domains again.

Peter Hinman
International Bridge / ParcelPool.com

On 11/12/2014 11:24 AM, Jay wrote:
> Hello everyone.
>
> I have a question hopefully someone will have some insight on. In ASSP
> 2.4.1(14085) we have a text file setup with a list of email domains we
> have put together to make sure our users get emails from these domains.
> The draw back that happens from time to time is a spammer will spoof an
> email address of one of these domains and ASSP will allow it through. My
> question is this, is there a way to tell ASSP that any addresses listed
> in this text file as white listed domains need to match an IP in order
> to be accepted as white listed? An example would be say @ups.com needs
> to match IP xxx.xxx.xxx.xxx in order to be accepted as white listed,
> other wise it's subjected to the filtering process like any other email.
> I could easily lookup MX records to implement this if there is a way to
> accomplish my goal.
>
> Thanks for any advice in advance.
>
> Jay.
>
>
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