To add a sender or domain to your whitelist please do the following.

1. Log into your Ozhosting Control Panel
2. Click on "Manage" in the Enterprise Spam Filter section
3. Click on "Domain Specific Settings" tab
4. Click on the "General Tab"
5. Click on "Antispam Controlpanel" link

This will take you into the Enterprise Spam Filter Control Panel.

1. Click on "Sender Blacklist"
2. Click on "Add Sender"
3. Add the email address or domain you wish to blacklist and click "Add"