dark mode for apple mail message body

Just to add, to view non-HTML emails with a dark background, Select "Show with Dark Background" from Mail > View > Message.

EDITED

From personal experience and take from there if you would.

In the General Settings as per below.

Light Mode is enabled, depending on time of Sunrise and Sunset which is controlled by " Language and Region " the e-mail body will switch from Black , when I get up at 04:30 AM EDT to White at around 06:30 AM EDT.

mark fromrichmond wrote:

I understand that you can use dark mode in apple mail for the background but how do you get the message body to use dark mode?

Unless the email is Plain Text, you can't.

See my post above yours.

Since the User is reply to oneself - difficult to to know to whom the reply is intended.

Think the user just above this reply has answered your question.