TorBox Information
The TorBox server provides email, IRC and XMPP services, but it can only be accessed by using the Tor Browser. The TorBox link is http://torbox36ijlcevujx7mjb4oiusvwgvmue7jfn2cvutwa6kl6to3uyqad.onion/.
You may also wish to consider Dead Drop Private Messaging at http://67pwjmdrwq7a7b2j3opm3ht7nqfey5gmtpufk65h6akrga7qasctk2ad.onion/.