To filter messages on an NNTP server, follow these steps:
1. Find an NNTP client that supports message filtering. Many popular NNTP clients, such as Thunderbird and Microsoft Outlook, have filtering capabilities built-in.
1. Choose the criteria for filtering. Depending on the client, you can filter messages based on sender, message content, subject line, date sent, or a combination of these factors.
1. Create a filter rule. In Thunderbird, for example, go to Tools > Message Filters > New to create a filter rule. Set the filtering criteria and actions to take on matching messages (e.g., move to a specific folder, delete, mark as read).
1. Apply the filter to your NNTP account. In Thunderbird, go to Tools > Account Settings > Server Settings and enable message filtering for your NNTP account.
1. Test the filter. Send a test message to your NNTP account that matches the filtering criteria and check that it is filtered correctly.
