Short answer: No.

Longer answer: but (as almost always) there is a possibility.
Open a terminal and navigate to
/home/user/.modest/cache/mail/
then cd to the directory imap or pop (depending on your account)
and then cd to your account (you will recognize it)
and finally to folders/inbox.
Now it can get tricky. You will find (a lot of) files with a ".~" at the end. These are your emails and contain full header info ...

Have fun
Ah, and btw there is also summary.nmap which may help you finding your specific mail easier