Okay, I don't know why
YOU'RE that hostile but maybe it's time to loosen the tinfoil hat and reread what the thread starter is worried about.
Someone getting a warrant 10 years from now to search through all his spam for pr0n and \/i@gra pills isn't what he's worried about, instead it's someone grabbing live wifi traffic about what email he's sending/receiving.
Like I said, Gmail probably doesn't support PGP so why not setup a VPN to your home computer if you're that worried, then ANY traffic over open Wifi points is secure.
Another thing, whole sessions aren't in SSL because SSL requires more CPU overhead, so authentication credentials are done in SSL and then it's cleartext for the rest. Same goes for alot of other webmail providers and alot of other protected areas, such as some chessy banks :-).
BTW: Unless you physically control the server, why do you assume ANY email service you have ever used deleted ANYTHING of yours?