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OntheFiletab,chooseOptions>Mail.UnderComposemessages,intheComposemessagesinthisformatlist,clickHTML,PlainText,orRichText.,Whilecomposingamessage,clickthethreedoticoninthetoolbarabovetheFromandTofields,thenselectSwitchtoplaintextorSwitchtoHTML.Saf...。參考影片的文章的如下: