To add entries to the blacklist or whitelist:
1. Navigate to the relevant tab under the Tools & Settings > Spam Filter Settings page.
2. Click on Add Addresses.
3. Enter the list of entries you wish to add.
Separate addresses using a comma, a colon, or a space. You may use an asterisk (*) to represent multiple letters, and a question mark (?) for a single letter.
For instance: address@spammers.net, user?@spammers.net, *@spammers.net. By specifying *@spammers.net, you will block the entire mail domain spammers.net. If you are using a Windows-based server, also indicate how to handle messages from the specified addresses.
4. Click OK.
To remove entries from the blacklist or whitelist:
Select the entries on the relevant tab and click Remove.