You can now use a spreadsheet with up to 1,500 recipients, with the ability to select any data column as a mail merge tag in Gmail
This newly announced integration is limited to Gmail on the web, at least for the time being.

You can now use a spreadsheet with up to 1,500 recipients, with the ability to select any data column as a mail merge tag in Gmail
This newly announced integration is limited to Gmail on the web, at least for the time being.
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