Yet Another Mail Merge also lets you send your mail merge to one or several Google Group. Please read this article for more details.
1. How to send a mail merge to a Google Group?
Simply list your Google Groups row by row in your spreadsheet (and some optional information like their names etc.), just like any other normal email addresses:
Then send your mail merge as usual (you can also activate the tracker if you want):
2. How will my campaign be tracked?
Everytime a Group member opens the email, YAMM will automatically record it as 'OPENED':
As there is only one email address (= Google Group account) per row, YAMM won't be able to know who opened the email.