Rated 5 out of 5 stars

This is a great addon for anyone who forgets to double-check (or should be double-checking) who and what they're sending in their emails. This extension worked flawlessly until the release of Thunderbird 45 (as of Secure Addressing v1.6) - the extension now prevents messages from being sent.

This review is for a previous version of the add-on (1.6).