I don't know of any truly secure email address. Hushmail was a popular one, but they openly let the authorities view your email simply by requesting it. Every other "secure" email service does the same thing. They openly allow authorities to view any emails they request.
Keep in mind, all email you send and receive is not secure. If you are using Hushmail for example, and you send an email to a friend of yours. If they aren't using Hushmail also, the email you just send is not encrypted (secured) from the rest of the world. But if he was using Hushmail, it would provide a little bit of security.
The only way to truly do secure email is for both parties to encrypt and sign their emails. Most people don't know what this is, let alone use it
.