QUOTE(epgeek @ Jul 21 2009, 05:33 PM)

How can you tell if a gmail address is still functional w/o actually sending a message to that address?
The best you could do is to try an SMTP session with the Google MX server. If the server rejects the attempt due to undeliverable address, you have your answer. If it does not reject, you can't really be sure (the address may or may not be delivered, you have no way to know).
There is a web service that will help you do this, I don't remember where it is at the moment (Farelf?). If you can speak SMTP, you can put together a scri_pt to do this, and then cancel before the DATA step (by which time you should have your answer).
The question arises, however, of what you would do with this information. Seems to me that once you notify Google, you've done about all you can do. The rest is up to Google. Bear in mind that it might take awhile for them to follow through.
-- rick