Open a New Message window in Mail. Then select Show Fonts from the Format menu.

In the Fonts screen, click the button for Document Color; a clor selection window will open. In that, choose the color you want for background.

mac邮件背景色

Note - if you do this before entering any text in the New Message, you can save it as a Stationery item, which means you can select it from the Stationery menu in the future, saving many steps.

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