The Yet Another Mail Merge add-on in Google Sheets is a useful tool for creating email merges.
Yet Another Mail Merge
Yet Another Mail Merge is a Google Spreadsheets Add-On that can be used to create mail merges via Gmail. If Yet Another Mail Merge is not already in your Add-On list, please go to Get Add-Ons to add it to your list.
Run the Yet Another Mail Merge Add-On
Prepare Your Communication
Have a spreadsheet ready with emails and any other information
Draft an email with the merge fields included in << FIELD>>
Make sure the draft has a clearly worded subject
TIP: Send emails in batches of 200 or fewer
Run the Yet Another Mail Merge Add-On
Go to Add-Ons → Yet Another Mail Merge → Start Mail Merge
Enter the Sender Name you would like to appear.
Select the email template for your mail merge. The email template can be a Gmail template or a draft email.
Check Track emails opened, clicked or bounced if you want to track emails
Click Send me a test email to confirm your setup.
Click Send Emails.
View Tracking Report
The Tracking Report will appear immediately after you start your mail merge. If you close the Tracking Report and want to return to it at a later date, click on Add-ons > Yet Another Mail Merge> Open Tracking Report.