[exim] Logging of message id

Hi All,

Is it possible to log the message id of a receiving smtp server? For
instance I run a bunch of mail relays, I'd like to be able to log the
message id (or maybe even the 250 response after the ".") so that if I'm
ever asked "my mail didn't reach its destination, what happened to it?",
I can "well my server sent the mail to server x, and its message id on
that server was y. Speak to the owner of server x to see what happened
there.".

Is this possible?


Thanks,

--
Peter Farmer