Microsoft Outlook 2019, 2016, and 365 can display or send messages in HTML format or plain text.
Just have a look at the controls below.
Choose Main Tabs in the Customize Ribbon dropdown, then ensure the Format Text option is selected.
How to Change View to HTML or Plain Text in Outlook 2019, 2016, and 365
Set whether you view or send email in plain text or HTML format in Microsoft Outlook 2019, 2016, or 365.
