On Wed, 29 Mar 2017, Alex wrote:

Would I need to create one ALL rule for each user involved?

Probably not, the username part could be something like (?:user1|user2|user3)@example\.com

I don't understand how ALL would help here.

You can't incorporate matches in one rule into a different rule, so it would need to be an ALL headers rule that matched two headers (the Received: with the envelope to address and the To:/CC: header) to detect an address mismatch. See the TO_EQ_FROM rules for an example.

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
 jhar...@impsec.org    FALaholic #11174     pgpk -a jhar...@impsec.org
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