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Thank you for contacting us. I am assuming that you would like the table lines to be a bit darker so the user can view the data correctly.
If you open the email notification, you can modify the table by editing the HTML. Press the <> to enable HTML mode
You can modify the border size to 2 or any value you like.
Once you have finished, press the OK button to save the changes.
Please let us know if this helps.