I would like to see an option where emails go to your server are encrypted and get forwarded unincrypted
Many people are not willing to do anything new not even to enter a password to open an encrypted mail.
Sad to say.
So I would like to see an option where mails and attachments are sent to your server encrypted and are forwarded to the recipient unincrypted. This has at least some security better than nothing for communicating with people who do not want to care with encryption.
I also would like an option where all mails that get sent unencrypted get automatically encrypted on your server and get forwarded just like the ones who come from a protonmail user. Not very secure but gives at least some security for receiving mails from people who don't care.