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In classic Outlook, select File > Options > Mail.
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Under Compose messages, select the drop-down arrow next to Compose messages in this format and select HTML.
Note:Â By default, HTML view for messages is turned on. To turn it off, go to File > Options > Trust Center Settings > Email Security.
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On the View tab in new Outlook, select
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Select Mail > Compose and reply.
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Under Message format, select the drop-down arrow next to Compose messages in and select HTML.
Note:Â By default, HTML view is turned on for messages. To turn it off, select Plain text in step 3 above.
