This is what GMail is doing: making sure that sending an email is like sending a letter (instead of a postcard). TLS email is not 100% secure (private, authenticated, etc), but not 100% insecure either.<p>Verifying TLS for email is an easy step in making email a bit less insecure, and it requires no intervention from users. If you need something secure, then yes, go for GnuPG or other forms of end-to-end encryption (if only I could name a few).