Currently you can make mail from the command line only, over Tor network. You gotta connect to Haklab 6666, with netcat.address on port
nc pn3txariluydilex4wixptk5w7bgjnidilmt6rqx3m2qilrxbyiwbhyd.onion 6666
After that just follow instructions from terminal. Important thing to note is that terminal won't hide your password nor show astrisks when you type it out, so be careful about snooping eyes.
As a mail client we recommend using Thunderbird.
You can make new account with client of your choosing, just set server to xmpp.hklbgd.org pick a username and you are ready to go. If you already have XMPP account you are ready to communicate with ours. If you wanna join Haklab group ask on mailing list or ask email@example.com ili firstname.lastname@example.org.
Gitea asks for email address during registartion, but you can type in any address, since it doesn't ask for email confirmation.