[GMail] Didn't get your invite?
Every once in awhile Slashdot - News for assholes has a decent read...
http://slashdot.org/articles/04/06/2...tid=217&tid=95
Apparently, GMail invites and emails are being altogether blocked by hotmail and sent to bulkmailer folder by yahoo. there doesn't seem to be hard proof, so take away from the read what you will.
If it is indeed the truth, that is really about as low as you can go. Service might be free at the above places, but free shouldn't imply free from ethics IMO.