Quoting Roland Illig:
> Return-Path: <"roland@???>
See
http://exim.org/exim-html-current/doc/html/spec_html/ch40.html#id2712900
and
http://exim.org/exim-html-current/doc/html/spec_html/ch44.html#SECTsubmodnon
and
http://exim.org/exim-html-current/doc/html/spec_html/index.html#toc0394
You probably have "control = submission" somewhere in your ACLs. The
easy fix is to change this to "control = submission/sender_retain".
I agree that the spec is a little unclear about all that...
Oh, and please don't use domains you don't own in your examples (like
client.de and server.de). There are the well-known domains
example.com/net/org for this purpose.