Yes, encryption before sending it to the server is possible as follows: Ask server for public key associated with email address, encrypt, send. But if other pe

Yes, encryption before sending it to the server is possible as follows: Ask server for public key associated with email address, encrypt, send. But if other people do not have this feature for their mail, the mail is encrypted on the server. The server should never directly store the private keys. Maybe more efficient than generating every time again is to use symmetric encryption on the client side to store the assymetric keys on the server in encrypted form.