no way to COMPOSE SEND an email...in a color other than, one by one..NO setting
So, most email web based services, let you 'set' a color, to compose your emails in, so that, ALL of your sent out emails, get sent, in a color. not black. yahoomail has no such setting.
Only able to make certain portions of a email, or all of it, a color- one by one for THAT email. No way to make a 'setting' for all composed emails, to be in a certain color. that is not 2019 more like 1919
You can change the color of your email text when comping by using the “Text color” button (3 colored dots) in the toolbar in the Compose window.