I have used Gmail since you needed an invite to use it and I've never had any other assumption than my e-mails being about as safely tucked away as they would be on a public notice board in a town square, and that Google in addition to this is probably scanning them frenetically to figure out what they, or more specifically their advertisers, can try to sell me.
If I need to send something I actually care about I wouldn't use e-mail in the first place. It's a low-effort type of communication with normal people who don't care about security, so I'm not going to waste time making my end of that line of communication an impenetrable bastion.
If I need to send something I actually care about I wouldn't use e-mail in the first place. It's a low-effort type of communication with normal people who don't care about security, so I'm not going to waste time making my end of that line of communication an impenetrable bastion.