Can someone PLEASE tell me where the settings are to set the default font size and text color when sending/replying to emails?

-Any email that I COMPOSE types the text in black (which is what I want) but the font size is large when the recipient receives it.

-Any email that I REPLY to, the text color gets changed to blue (including all previous emails within that email) and font size is also large when the recipient receives it.

This is extremely frustrating, I've never even seen this issues before with a phone. Would appreciate anyone help.

Thanks.