But: such a tap would reveal no information about gmail-to-gmail communication, no? Most gmail usage is via their SSL web app or an email client, and their dir

But: such a tap would reveal no information about gmail-to-gmail communication, no? Most gmail usage is via their SSL web app or an email client, and their directions for most (all?) clients specify to use SSL. And in my experience, most people using gmail send most of their emails to other gmail accounts.