Am 27.12.2012 23:53, schrieb Michael Heydekamp:

> First: After some more investigation, it looks as if almost ALL messages
> that came in through our server do carry a header "Return-path:" (opposed to
> "Return-Path:"). I have no idea yet who is responsible for that (Exim,
> dovecot...?), but there is definitely some header munging happening
> somewhere. :-(

But, I have the idea. 
It is Exim (as our MTA) that add the Return-path.

> But as this is a pretty standard Debian Squeeze server, we're for sure not
> the only ones who will be running against this brick wall.

And Exim is the Standard Debian MTA.

-- 
Mit freundlichen Grüßen
Martin Wodrich
Admin of freexp.de
Waltrop/Germany
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