Hi,
Inserted background pictures will indeed fill the entire background of the message.
But if the message window is wider or higher than the inserted background picture, it will repeat itself instead of filling or stretching the image to the message window like a Desktop Wallpaper.
And I am afraid there is not a direct way for this in Outlook. But you can still insert a picture as a background image and not have it repeat itself via the following workaround:
1. Create a new email.
2. Select Insert > Pictures.
3. Browse your computer or online file locations for the picture you want to insert. Select the picture, then select Insert.
4. To resize the picture, drag the handles at one of the four corners toward the center of the image or away from the center. Just fill the message interface with the picture.
5. Click Wrap Text, select Behind Text in the pulldown menu.
Thanks for your understanding and hope this can be helpful.
Regards,
Aidan Wang
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