Rated 4 out of 5 stars

per Jeffrey Flaker el oct. 21, 2014 ·

I have to say, this is a very nice addon. However, if Enigmail is installed, it will encrypt every outgoing email with your key only. This makes the message unreadable for the intended recipients. Disable Enigmail with a restart of Thunderbird....run your mail merge, then re-enable Enigmail........

This review is for a previous version of the add-on (3.9.0).