> doable by blocking messages with a null sender (<>) that don't originate 
> from your SMTP server... but I'm not familiar enough with the SMTP 
> protocol to know what other, possibly legitimate mail this might block.

Nope, blocking null senders you'll also block outlook read receipt and a few
other things

And it's not 'don't originate from your server', but from any of all MTAs
your users can use.

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