On Tuesday 13 October 2009 15:40:32 Iseli, Erich wrote:
>
> I then had a look at the messages kept in /var/spool/postfix/hold with
> postcat and I couldn't believe my eyes: actually postfix must be mangling
> something since the "from"-address is absolutely correct! 

> sender: @domain.com

The sender is blank, which is what Exchange is complaining about.

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