Outbound SPF checking could accomplish what Adri�n wants (i.e. applying SPF checks to relayed messages, not just to incoming ones). An SPF record for the "my-domain" domain with an "exists:..." SPF mechanism and a correspondingly set up DNS server would be required, though.
Interesting. I was previously unaware of the exists: mechanism. You'd still need a Courier filter that implemented SPF, since Courier does not.
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