If you have enabled SpamExperts mail filtering on your domain then you can add your mailboxes to it to allow your users to manage their own spam settings.
Please note that if you decide to do this then all mailboxes on your account will need to be added. Once you have added one user mailbox any others not added will not receive inbound email.
To add a mailbox, login to your control panel and select Virus and Spam Filtering from the top menu.
Select Email Level Accounts.
Select Add New. You will be provided with a list of mailboxes on your account, simply select these to add to the mail filtering service.