http://hhldo3tnt5solzj2bwfvh7xm4slk2forpjwjyemhcfrlob5gq75gioid.onion/en/index.html
Open
the OpenPGP Key Manager
to make sure
the recipient is listed there. Unable
to send message You could get
the following message when trying
to send your encrypted email: "Unable
to send this message with end-
to-end encryption, because there are problems with
the keys of
the following recipients:
[email protected]."