Message Format – HTML, Plaint Text, and Rich Text
https://www.extendoffice.com/outlook-tutorials-edit-send-emails/...Message Format – HTML, Plaint Text, and Rich Text. Have you ever received messages with regular text only, or emails with plenty of images and various font formats, such as bold, Italic, underline, color, etc. in Outlook? Outlook supports to send emails in different message formats: HTML, Plain Text, and Rich Text.