Need help in debugging Email wireshark capture

Hi,
I am completely new to wireshark.
I have been given an assignment to analyse email capture with wireshark.
Can anyone please help me how to proceed further and what I should look for in a wireshark capture?
Thanks,
ang

This may be a little late for your assignment, but the explanation I posted on this thread http://forums.meulie.net/t/need-help-in-tracing-packets-on-email/6559 covers some basic ports and such for email. Hopefully this will help somebody out when they search for it.