This is a bad move that will give users a false sense of security.  Server-to-server SMTP is unauthenticated.  Just because an email arrived at Gmail over an encrypted connection doesn&#x27;t mean that the connection wasn&#x27;t intercepted by a MitM that read the message and then relayed it to Gmail over an encrypted connection.<p>Opportunistic encryption is nice to have because it stymies passive surveillance, but it&#x27;s not something that can be relied upon to provide security or privacy.  Thus, its presence or absence should never be communicated to users, to avoid suckering them into a false sense of security.