Marrco wrote:
>> 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

Not to mention the RFCs say you have to accept null senders.

Kevin


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