Am 27.08.2010 11:22, schrieb Ronald Klop:
> Mandatory? I'm googling, but can't find a document that declares it  
> mandatory and only sendmail seems to do it.
> I think it is lame to use DNS info to rewrite e-mail addresses, but the  
> person who made it 'mandatory' will have good reasons for it.

May have been RFC0974, perhaps in connection with others - January 1986...

-- 
Matthias Andree
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