Rated 5 out of 5 stars

Good technology experiment to slowsdown spammers with sending spam. Using the generated e-mail header with your outgoing mail makes it possible to improve your delivery chance to the inbox instead of the spam folder.
This addon depends on Java(JRE) and that has to be installed and configured to be able to use this extension. This is sadly not easy to use for most average computer users.

This review is for a previous version of the add-on (1.5.3).