I’ve used MarsEdit for >18 years now. (Back in the day it belonged to Brent Simmons.) You’d think I’d know it pretty well. However, my latest feature request was solved by simply using the Status Bar menu item already available to me! 🤦🏽‍♀️ @danielpunkass is a gentleman!

MarsEdit email dated 2004.
Screen Shot showing character count.
Miraz Jordan @Miraz