To add entries to the black or white list:
1. Go to the corresponding tab of the Tools & Settings > Spam Filter Settings page.
2. Click Add Addresses.
3. Provide the list of entries you want to add to the list.
Separate addresses with a comma, a colon, or a white space. You can use an asterisk (*) as a substitute for a number of letters, and question mark (?) as a substitute for a single letter.
For example: firstname.lastname@example.org, email@example.com, *@spammers.net. Specifying *@spammers.net will block the entire mail domain spammers.net. If you use a Windows-based server, also specify what to do with messages coming from the specified addresses.
4. Click OK.
To remove entries from the black or white list:
Select the entries on the corresponding tab and click Remove.