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On the File tab in classic Outlook, select Options.
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On the left, select Mail.
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Next to Compose messages in this format, select the drop-down arrow and then select your preference: HTML, Rich Text, or Plain Text.
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Select OK to save your changes.
Tip:Â For details about the three format options, see HTML, Rich Text Format, or plain text.
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On the View tab in New Outlook, select View settings.
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Select Mail and choose Compose and reply.
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Under Message format, next to Compose messages in, select the drop-down arrow and then choose your preference: HTML or Plain Text.
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Select Save to save your changes.
