Also it's missing a 'Terms of Service' 'Privacy Policy' 'Business Agreement' or 'DMCA Policy' pages. Not very trustworthy, if you don't know where your 'encrypted' data sits.
I would recommend to look at ProtoMail.com.
They provide a lot of transparency, even open-sourced there protocol.
If you want Users to trust their data, your Server, you'll have to provide more than a 'good encryption'.