Discussion moved from Community Help to Email Gateway (formerly Ironmail) for better attention.
You can stop the link renewal by going to Anti-Spam --> Anti-Spam Advanced --> End User Quarantine --> Configure. My guess is that you have the EUQ Link Expiration set to Always. This will change the link every time a new notification is sent out, resulting in the message that you are reporting. Chaning this to Never will allow the user to always use the same link to access the messages, without recieving the change notification.