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This little extension will:
– check your syntax
– make sure your tables have widths and try to determine if the values are correct
– highlight attributes that are best avoided
– score your performance (try to get 100 points)
If you want it to work on local files, make sure to go to Tools > Extensions (chrome://settings/extensions) and check the “Allow access to file URLs” box.
The code is also available at:
https://github.com/artbek/Mailer-Checklist