1. Enter SPAM Expert dashboard via client area. If user is not familiar with this then may refer to the below guideline: (How To Enter SPAM Expert Dashboard) Please click here. 2. Once enter, click on "Sender Whitelist" button under "Whitelist/Blacklist" session.3. Key in the email address or hostname that you with to whitelist.4. Click on "Add" to whitelist the email address / hostname.