[exim] Exim Log Mrtg

I use greylisting etc in exim to reduce spam. Also spamassassin after
that. I want to graph with MRTG the number of attempted deliveries in
exim vs the number of accepted. Looking at the log file I am guessing
I can get number of completed by looking for entries that contain
"virtual_localdelivery". Not sure how to get count on attempted
though? Any ideas?