Never really noticed, but I’ve been using GMail without SSL all this time! Now that is embarrassing!
“Wow, you ignorant newbie. And to think I’m your alter ego, how do you think that makes me feel?”
Anyway, this problem is easily solved by just changing it from http to https: so the URL is then https://mail.google.com/mail/ and bookmark that instead!
And if you don’t know what SSL is, then let me just simply tell you that it’s a widely accepted standard that secures online communications (including the sending of files and stuff).