[Exim] advanced warnmsg

Hallo eximusers,

In the warningmessage the cause errors is not output, but in the logfile.

20:14:29 146H2T-0003Rv-00 mx0.gmx.de [213.165.64.100]: Connection timed
out
20:14:29 146H2T-0003Rv-00 == user@??? T=remote_smtp defer (110):
Connection timed out

Why can i print this errormessage in the configured warnmsg_file?
exim-3.12

Thanks Heiko