SheetEngine
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Install the Google Sheets add-on

Start the 15-day trial. Gallery and dry-run stay. Live send after day 15 needs $5/mo, $55/year, or $250 lifetime.

1. Install

Open the Marketplace listing (placeholder until the public app ID exists) and install Sheet Engine for Google Sheets.

Install from Google Workspace Marketplace

Placeholder destination: workspace.google.com/marketplace

2. Open and dry-run

Extensions → Sheet Engine → Open. Pick Lead acknowledgement. Run dry-run. Enable Live when the To line is right.

Install help