How to set up censorship-free webmail
by Dave Kimble at www.peakoil.org.au

Another way of communicating is by secure webmail.
One place offering a free secure webmail service is www.hushmail.com.
When you login, the site will switch to a secure HTTPS connection and that will be used for your access to the usual webmail interface.
When signing up for an account you will need to provide a strong password, which means a long password or "passphrase" at least 32 characters long.
If the email address of the person you are communicating with is a HushMail address too, then the communication is secure.
It really is as easy as that.

HushMail offer more sophisticated services for a fee - see the website and its FAQ section for details.