[hawski]

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's Encrypt.

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.

Main use would be to use generated by application unique addresses for registration purposes.