dep wrote:

> and i think i've carried the forum terribly off-topic. i am not, btw, a
> protonmail salesman!

ok, but I still have a question - how does it know the public keys of the
users or the private key of the sender and how the sender provides the
password for the private key to encrypt?
To me it looks like it is meant to secure domain based users, that all have
keys shared somewhere and it is not clear if it encrypts also the subject
or not.
I'll ask the friend that hosts my domains. I think he evaluated this few
years ago. This is also we decided to invest in our own domain hosting, so
that we at least know where the domains are located.

regards