The Mail Protection Gateway help identify messages with potential malware. Some messages in your Inbox may now be flagged with the following category in the Subject of the message:
[Possible Malware Message]
Messages that contain a suspicious URL, will be rewritten in the body of the message, by Cisco. For example:
When you click on the link, you will be taken to a Cisco page that will automatically re-direct you to the Cisco Security page.
Cisco will run a check on the URL to determine if it is malicious.
Once the check completes, you will be asked if you Trust/Don't Trus the site. You should only select "I trust this site", if it is a known site to you.
If you select, I don't trust this site, you will be helping Cisco add to their database of mailicious sites.