spf-discuss
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RE: Opening Debate on SPF vs. SenderKeys

2004-08-23 06:12:43
On Mon, 23 Aug 2004 15:32:56 +0300, Andriy G. Tereshchenko wrote
Wrong. In case if you are using non-SPF aware ISP you must be able 
to perform email filtering in your MUA. You can check IP address 
from Received: against SPF records and move forgery to "Spam" folder.

This is dangerous.  Your MUA may be retrieving that mail days or even weeks
after it was sent.  The SPF record that was in force when the mail was sent
may no longer be the same as the one you're checking against.