A table border can separate content, highlight important cells, and make a structured email layout easier to scan. In Mail Designer 365, select the table first and open Borders in the Style menu.
Apply a table border to the whole table
Open the area dropdown in the Borders panel. To apply the same border around the full table, choose Table Body. This keeps the change scoped to the table rather than unrelated design elements.
Next, choose a border style from the dropdown list. Adjust the thickness with the arrows or enter a pixel value manually. Start with a subtle width, then preview the result before increasing it. A very heavy table border can compete with the email content, especially on smaller screens.
Choose a suitable border color
Use the color control to match the border to your email design. A neutral or brand color usually provides enough separation without distracting from headings, text, or calls to action. Check the contrast against both the table background and the surrounding email background.
The control panel also lets you apply style changes to a particular part of the table. This is useful when you want a divider between rows or columns instead of a border around every edge.
Add a border to one table cell
To style only one cell, click that cell and select Current Cell. You can then choose its border style, thickness, and color in the same way as for the full table. This is helpful for highlighting a price, date, total, or other important piece of information without changing the rest of the layout.
Review the table before sending
After applying the table border, check that the thickness and color are consistent in every section you intended to change. Preview the email at desktop and mobile widths, and send a test message so you can inspect the table in a real inbox. If one cell looks different, select it again and confirm whether Current Cell or Table Body is active.
Continue with adding content to your tables once the structure and border styling are ready.
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