I have added a table in the email body in Send Notification workflow action. Then, I select "Show Grid Lines" and select one of the table style. It shown perfectly in the design mode. But it does not showing the table gird and the style in the notification emails.
Am I missing something? Does anyone have the same problem?
I suggest you to show grid lines in different ways and test how you email client renders your style.
Consider that email formats are renderer by every email client in a different forms, even the preview.