Which Tor based e-mail services are good?

I found:
http://bitmailendavkbec.onion - BitMessage (bitmessage.ch)
http://mail2tor2zyjdctd.onion
- Mail2Tor (mail2tor.com)
http://en.onionmail.info/directory.html - OnionMail.info
http://lelantoss7bcnwbv.onion - Lelantos (lelantos.org) not free
http://sigaintevyh2rzvw.onion - SIGAINT (sigaint.org) - OFFLINE