5117 shaares
If the goal is simply to encrypt the body of the message there are services and products that accomplish this. You could use traditional PGP/SMIME to encrypt the body of the message. If you were to do this, you would still have to manage the keys yourself. You could go a step further and have a server that manages keys/users for you, or a collection of federated servers. Such a beast might look very much like the PGP Universal server. For an individual, a server, or collection of them probably isn’t practical. For a company, it could make sense.