Entourage - see email origination details

Hi, I'm new to this forum so thanks in advance for help.
What I'm asking is whether it's possible to see the originaton details of a mail that spent some time as a draft before being sent?
i.e. can you see when a received mail was created if that it is different from when it was received.
The long story is that I'm in the cr*p for a time sensitive mail not being received on time. The person who sent it swears that it was sent on time but for some reason went to his drafts or outbox folder without being sent. The mail was sent from that folder the next day and was received but too late. I have the mail and I want to prove that there was at least an attempt to send it on time but the only info I can see is when it was successfully sent and received (i.e. too late), I want to see when the mail was actually written and attempted to send but can't see anyway to get to this info.
Thanks again for any help.