>> What types of legitimate messages use null sender? Is it only DSN 
>> type messages? Someone else (Marrco?) said that Return receipts & 
>> vacation

> Bounce messages have a null sender, or else it'd keep on bouncing 
> back and forth. You don't want that to happen. There are legitimate 
> reasons for a null sender and it shouldn't be blocked.

True, and true - but only the originating server (in my case, *mine*) 
generates *legitimate* 'bounce' messages, so I can certainly block 
illegitimate bounces (aka 'backscatter').

The only question here is how to do this without blocking *other* 
legitimate messages with a null sender.

-- 

Best regards,

Charles

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