I was thinking about similar service. What would be different is that I would give user subdomain and redirect all incoming traffic on SMTP SSL port to connected client. I would give access for user to get SSL cert from Let&#x27;s Encrypt.<p>All this would give something better than promise that I would not look at private emails, but I would have to build client application that would be SMTP server inside. Handling LE automatically and all other seemingly unrelated things.<p>Main use would be to use generated by application unique addresses for registration purposes.