Yet Interesting Mail Merge (YIMM) is a Google Workspace add-on that lets you send bulk email straight from Gmail. Draft once, swap in variables from a Google Sheet, and send to every recipient — no copy-pasting, no extra apps.
How to use it
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Install YIMM from the Google Workspace Marketplace (coming soon).
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Draft your email in Gmail and prepare a Google Sheet with a row per recipient and a column per variable.
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Send the campaign — YIMM swaps each variable, fires off the emails, and you're done.