They use 256-bit with TLS 1.0 and support IMAPS, POP3S and SMTP which you can use with Thunderbird and also RoundCube web mail. Tested it my self works very well ^_^ In fact I found it better working for me then some premium services like HushMail.com or free service like Safe-Mail.net I'm very happy to find something that finaly just work without too many registration questions or phone activation.