To make sure everything is formatting correctly, click Send me a test email to receive a sample message. Toggle to Gmail and check the message. If everything looks good, return to that dialog box and click Send Emails. You’ll now see EMAIL_SENT next to each contact in the Merge Status column of your spreadsheet. If you want to perform another mail merge from that same spreadsheet, remember to delete that text from the Merge Status column of each recipient you want to email again.