If you're writing an email in Polymail and want to format your text, you can do so with the formatting toolbar towards the top of your draft:
With this formatting toolbar, you can:
bold
italicize
underline your text
change the font you're using
change the font size
change the font color
create lists or bullet points
hyperlink text
You will also see a clear formatting icon appear once you've highlighted text in your draft:
This will clear your text of any previous formatting you might've brought with you through copying and pasting from another source or any formatting you've done to your text within your draft. For example, if you bold your text and change the font, the clear formatting option will remove the bolding and change your font back to default.