> 1) If the sender meant to send the mail, then the recipient knows who  
> the user is anyway.

Ehh, wrong. A malicious sender could have forged the headers.

> 2) If the sender *didn't* mean to send the mail, the info is very  
> useful for anti-spam measures (and for you, in an abuse report).

You might have missed this part of Hans' mail:

> >Knowing which account was used to relay a given message may  
> >certainly be useful in some cases, but this doesn't necessarily  
> >need to be common knowledge. A hash of the account name and some  
> >salt would be enough to track an account if necessary.

I think he got a point.

Regards
Michael

-- 
It's an insane world, but i'm proud to be a part of it. -- Bill Hicks

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