When you are composing, replying, or forwarding an email in Outlook, you can easily add emphasis mark under every character of the selected text in the message body easily.

1. In the message body, select the text you will add emphasis mark for.

2. Go to the Font dialog on the Format Text tab, and click the anchor  at the bottom-right corner to open the Font dialog.
Tips: you can also press Ctrl + D keys together to open the Font dialog.

3. In the Font dialog, enable the Font tab, select the emphasis mark from the Emphasis mark drop-down list, and click the OK button.

Now the specified emphasis mark is added under each character of the selected text.

If you need to remove the emphasis marks from the specified text, please do as follows:

1. Select the text whose emphasis marks you will remove.

2. Go to the Font dialog on the Format Text tab, and click the anchor  at the bottom-right corner to open the Font dialog.

3. In the Font dialog, enable the Font tab, select (none) from the Emphasis mark drop-down list, and click the OK button.