Not so fast!
Checked the whois and it didn't look right: http://whois.domaintools.com/220.127.116.11
Searched around and found articles and blog posts listing different IP addresses and there's listings for unseen.com, also in Iceland. Firefox didn't like the look of the unseen.com security certificate.
What's their business model? How do they propose to pay for their staff, hardware, and service costs? All the secure email services I've seen charge a yearly or monthly fee.
It's strongly encrypted but there's also the option to recover your password (via another email account) which means they hold your keys and those can be passed on to law enforcement and intelligence agencies (like Apple, Google, Yahoo!, M$, etc. do), especially through security agency "partnerships." If they can get hold of your keys, and therefore all your data, then there's a good chance that other private security agencies can get it and so on down the line.
The only secure email would be run through a free and open source client with a trusted security audit, uses strong end-to-end encryption, and connects to the mail sever via an anonymising router, e.g. TOR. Only the end users hold keys and have to explicitly share their public keys in order to read each others' messages. If you ever lose your keys, then you lose access to all your previous messages permanently. If there are any password or key recovery options, then the system is not secure.
Also at the moment, there's not much point in using a secure email service if you're only going to email people with Apple, Google, Yahoo!, M$, etc. email accounts. It's a bit of a chicken and egg situation; you have to get everyone on your contacts list onto secure email for it to be secure and private. For that, they have to be security and privacy conscious enough to want to pay for it and to be organised enough so that they can keep their encryption keys safe and secret.
We're more at the proof of concept stage than an actual roll out of secure telecommunications.