http://hhldo3tnt5solzj2bwfvh7xm4slk2forpjwjyemhcfrlob5gq75gioid.onion/en/index.html
This will create a new draft message, as if you had just hit the "Write" button, but
in the attachment you will find your public keyfile.
Address the message to
[email protected] . Put at least one word
(whatever you want)
in the subject and body of the email.