[MlMt] Finding duplicates

[Justin Mallone]

Hi,

I have a gmail account and a FastMail account (among many other 
accounts!). For a while, I was forwarding emails from the gmail account 
to the Fastmail account while keeping a copy on the gmail account. This, 
of course, led to many duplicate emails. (I've since changed the 
behavior to "forward to fastmail and delete on gmail"). I'd like to use 
MailMate (or some other tool) to find the dupes and delete only the 
copies on the gmail account.  Possible? Best way to do this? Thanks!

-JM