Problem with Customer Specific Spam Submission Buttons on Messaging Gateway 10.5

Hello,

We have installed Symantec Messaging Gateway 10.5 on a customer and followed the steps in the manbual to enable customer submissions for custom spam e-mail rules. Currently, it's possible to submit messages from an administrator account's Quarantine, but I can't make the "This is Spam" and "This is Not Spam" buttons appear in the Quarantine for non-admin users, even though I have already added their accounts to the submitters list.

I have a submitter ID and the customer-specific rules are enabled for the users's policy. I also activated the submissions checkbox for the content incident folder.

Could anyone help me with this issue? 

Thanks!