When you have cPanel's link traversal protection enabled, it may sometimes interfere with the mailing list archiving functionality. Link traversal protection is designed to prevent malicious users from accessing files and directories they shouldn't.

Here are steps to fix the mailing list archiving functionality when link traversal protection is enabled:

1. Login to WHM:

   Log in to WHM (Web Host Manager) using your administrator credentials.

2. Disable Link Traversal Protection for Mailing Lists:

   • Navigate to Security Center in WHM.
   • Click on Link Traversal Protection.
   • Find the mailing list software (e.g., Mailman) and disable link traversal protection for it.

3. Update Mailing List Configuration:

   • Log in to cPanel as a user with mailing list management privileges.
   • Go to the mailing list management interface (usually provided through the Mailman icon).
   • Look for options related to archiving or file access. You may need to adjust settings related to archive directory permissions or URL paths.

4. Rebuild Mailing List Archives:

   • In the mailing list management interface, look for an option to rebuild or recreate the archives. This will ensure that the archiving functionality is updated to work with the new settings.

5. Test the Archiving Functionality:

   • Send a test email to the mailing list and check if it's being archived properly.

6. Re-enable Link Traversal Protection:

   • After confirming that the archiving functionality is working correctly, you can re-enable link traversal protection in WHM for the mailing list software.

7. Monitor for Issues:

   • Keep an eye on the mailing list archives to ensure that they continue to function properly after re-enabling link traversal protection.

8. Review Logs (if necessary):

   • If you encounter any issues, check the logs for both cPanel/WHM and the mailing list software for any error messages or warnings that might provide further insight into the problem.

Remember to always exercise caution when making changes to server settings, especially in a production environment. If you're not sure about a particular setting, it's a good idea to consult with your hosting provider's support team or a qualified system administrator.