Gordon Messmer writes:

> On 06/12/2012 05:15 AM, Alessandro Vesely wrote:
> > But it wasn't in the folder it should have gone to.  It isn't
> > anywhere.  I only have seven (other) messages from that guy,
> > so I run a
> >     find ./Maildir -type f | xargs grep -li xxxx@yyyy
> > search, but it only found the same seven messages as the MUA.
>
> You're looking for the wrong information.  The 'from' address listed in
> the mail log may not be anywhere in the message file.

It should wind up in the Return-Path: header, if everything is set up  
properly.