What difference has the forwarder made? As I said above, the sending MTA
not SPF checked the mail, so would bounce it anyway. That's the only
SPF-based reject won't produce a bounce. It's also where the forger gets
doubt s/he's going nowhere.
One thing in this discussion I am not sure of.....
When you said "sending MTA", did you mean the forwarder or the originating
I ask because if you meant the originating sender, then it doesn't make
sense at all. Typically originating MTAs do not check SPF on emails they
are sending. That is the job of the receiving MTAs. Both the destination
MTA and the forwarder are receiving MTAs. If an email is going through a
forwarder, then it does not make sense for the destination MTA to do SPF
checks on email it receives from the forwarder.
Sender Policy Framework: http://www.openspf.org/
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