Mergo allows you to create a personalized email template in Gmail and perform a Mail Merge from Google Sheets with Mergo to hundreds of recipients within minutes
Video Demo - https://lehighonline.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=acba0941-e018-4252-9b1a-af3a00bff41c
Access to Mergo is controlled by joining the Lehigh group - https://groups.google.com/a/lehigh.edu/g/mailmerge-list?hl=en
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