You can turn the Ignore Filter on or off from the Message Boards Settings page by following these steps:

1. Click the Message Boards Settings link in the upper-right of every page on Message Boards.
2. Click the Ignore Settings link on the left side to open your ignore user settings.
3. Check the box next to Filter messages from users in my list to turn the filter ON or check Do not filter messages from users in my list to turn the feature OFF.
4. Click the Save button to make your changes take affect and return to the message boards.