Rated 4 out of 5 stars

It works well. One problem is that it is very easy to click "Send" instead of File/MailMerge after entering your list of recipients. This leads to the embarassment of an email with {{FieldNames}} rather than the fields values.

Is it possible to prompt for Send if the email contains {{Field}}s?

This review is for a previous version of the add-on (3.5.0).