How to tell which email item fired the event

I am writing a utility which is supposed to monitor my junk folder. Each time
a new email comes into the junk folder it gets the email address of the
sender and checks to see if it is in my customer database. Then it checks the
domain of the email address to see if it is in a list of domains that I care
about and lastly it checks the subject to see if it a topic I would be
interested in. If all this fails I delete the email. The program runs great
for a while. I will fire anywhere from once...

How to tell which email item fired the event