I thought it was difficult to fake the "x-declude sender"?

That's the problem -- the *only* information that is very difficult to fake is the IP address that connects to your IMail server. Any other information is trivial for a spammer to fake.


Should I advise all my users NOT to have themselves in the address book to
prevent spammers from exploiting this feature?

That would be recommended, yes.

-Scott
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