[Exim] debugging config

Hi,

I've got a conf file that's driving me crazy, not doing what I expect. Since
I know everyone has better things to do than look over some newbie's conf
file, I'm looking for a command line option to test that fully simulates
receiving a message from a remote host, so I can try to follow what happens
via the debug output. When I take out the change I made that causes mail from a
certain sender to be rejected, I get a log line with the following info:

<= XXX
H=ZZZ [e.f.g.h]:47006
I=[a.b.c.d]:25
P=esmtp
S=777
id=blahbalh
T="testing" from <XXX> for YYY


I've tried:

exim -d -oMr local-smtp -oMs ZZZ -f XXX -bt YYY

and

exim -bs -d -oMr local-smtp -oMs ZZZ

But these don't seem to fully simulate what happens, because the mail is
accepted, when a real message from the host is not.

Any suggestions?