> Either way you pretty much have to deal with these problems today though, an awful lot of e-mail is sent/received over HTTPS Nitpick: I believe you meant to

> Either way you pretty much have to deal with these problems today though, an awful lot of e-mail is sent/received over HTTPS Nitpick: I believe you meant to say TLS rather than HTTPS. The majority of sending indeed takes place over TLS, at least between top-tier senders and ISPs. Google's Safer Email Transparency Report shows how many inbound and outbound connections to/from Gmail are protected by TLS, and the numbers have been climbing steadily in recent years: https://transparencyreport.google.com/safer-email/overview https://transparencyreport.google.com/safer-email/overview