Have you read the Terms of Service on Gmail? Know what I’m talking about? It’s the click-through button you have to click on before you can sign up. Did you know that Google’s “privacy statement” says that they will search all of your email, categorize it, and use that information later? There is not even a hint of a reasonable expectation for privacy for Gmail.
By the way, what about attorney’s clients and their email use? Perhaps more attorneys should do what I’m starting to do: give each client their own, private email account on my domain. Then we can communicate with some enhanced security and no waiver of privilege.