To make sure ASD doesn't mark the About newsletters I have subscribed to in dark red, for example, I have added the "about.com" domain.
To add a sender or domain to the ASD Clean List:
- Select Setup Clean List from the Advanced Spam Defense toolbar.
- Make sure From (Sender's Email-address or Domain) is selected.
- Click Add new.
- Type the email address or domain name.
- To whitelist all About newsletters, for example, type "about.com".
- Hit Enter.
- Click the Start/Pause button.
- Click Apply.

