[Exim] keep a copy instead reject mail

Hi,

I just saw in the reject log that there was a mail rejected
(error: "syntactically invalid argument(s):"). In those cases
I would rather take the email and keep a copy for administrators
eyes than reject it. Is this possible?
Exim is 3.15.

tia
Jan

--
Jan Schreckenbach                      email: Jan.Schreckenbach@???
SAP AG Walldorf/Baden, Germany         Phone: +49-6227-7-47474
LinuxLab                               Fax  : +49-6227-7-70830

SAP LinuxLab support address: linux@???