Re: [exim] Bad Header - Bad Form

> Exim *does* to some fix-ups if it's in "submission" mode. If
> you look at the _default_ Exim "configure" file, you'll see that in the
> "acl_check_rcpt" ACL you can see "control = submission" applied to mails
> from +relay_from_hosts and authenticated mails.

I suspect that Exim's submission fix-up can corrupt From header line in some
cases. My advice is to try to change all "control = submission" lines to:

control = submission/domain=

(with nothing after "domain=").