This article explains how to choose a default font, size, and color in AOL Mail on Windows 10, 8, or 7 and on Mac OS X or later.
When you update your AOL Mail settings, you can choose from nine fonts, seven font sizes, and dozens of font colors.
The next time you compose an email, the new default fonts you set will be used. You can change them manually per email if you want.
Log in to your AOL Mail account and go to the inbox.