Rated 5 out of 5 stars

I needed to send a simple e-mail to 50+ members to confirm their contact info. (Nothing fancy, no logic conditionals) The MailMerge extension worked perfectly once I conformed my source .csv file to the exact variable names supported by Thunderbird (no spaces, capitalization the same) , and the sequence it expects (i.e. followed the developer's instructions).

This review is for a previous version of the add-on (4.12.0).