Sometimes, when you reply or forward an HTML email, Outlook includes the outer background color in your reply. This can get a little annoying so here’s how to handle it, courtesy of Outlook Help.
To remove the background color:
1. Hit the reply or forward button on that email
2. On the Options tab, in the Themes group, click Page Color.
3. Select “No Color”
If you’d like to change the background color or the stationary, click here to find out more.