How to Add a Background Image to a Message in Outlook
Add a background image to Outlook to spice up your emails and make them look different than those with a white background. Not only can you make the background of your emails a solid color, gradient, texture, or pattern, but you can choose a custom picture so that recipients see a large image behind the email text.
Open the Microsoft Outlook desktop app. Go to the Home tab and select New Email. Or, press Ctrl+N. In the new message window, place the cursor in the message body. Go to the Options tab. In the Themes group, select the Page Color dropdown arrow. Choose Fill Effects. In the Fill Effects dialog box, go to the Picture tab. Choose Select Picture. Choose where to find an image to use as the background for the Outlook message: Select From a File to insert an image from your computer. Select Bing Image Search and enter a word or phrase to find an online image. Select OneDrive to insert an image from your OneDrive account. Choose the picture, then select Insert. In the Fill Effects dialog box, select OK.
How to Insert an Outlook Background Image in macOS
You can easily add a background image to a new email message in Outlook for Mac, as well.
Select From a File to insert an image from your computer. Select Bing Image Search and enter a word or phrase to find an online image. Select OneDrive to insert an image from your OneDrive account.
Click in the body of the email. Choose Options > Background Picture. Select the image you want to use as the background picture, then click Open.