Email's come into MAX Agent with a 'system' font however that is not a selectable font while you are working in the email. Currently, you only get 5 font choices and system isn't one of them.
If I copy/paste something it only offers to paste it as it rather than match the font so I then have to highlight the entire email and change to a different font so the font can match all the way through, and all things pasted that show in a different font, size, color, etc. and that doesn't appear professional and so it takes extra time and work to adjust the font.
If system font is the default font it should be an option in an email.