Set Page Color to No Color when Forwarding or Replying in Outlook 2010
Is it possible to automatically clear out the page color of a message in Outlook 2010 when replying or forwarding an email?
Make sure that either your theme is turned off or if you have a theme the background image is unchecked.
File > Options > Mail > Compose Messages > Stationary and Fonts > Theme
OR... you could always send in plain text.
File > Options > Mail > Compose Messages > Plain Text