That's not the same as reading through your phone messages. You have to assume that any message you send out is read by any number of parties. Any e-mail you s

That's not the same as reading through your phone messages. You have to assume that any message you send out is read by any number of parties. Any e-mail you send to a Gmail account, for instance, will be processed by Google for (among other things) advertising purposes. If you don't like that, you need to employ additional measures, such as PGP.