In mail forms we can insert hyperlinks to any uniform resource locator (URL).When we insert hyperlinks in mail forms, we can use tracking functions to record how recipients respond to the hyperlinks.
i know that this tracking is based on
Tracking through an intermediate site
When we send the personalized mail, the system adds a globally unique identifier (GUID) that identifies the business partner and campaign
Where we can see this GUID information Regarding Tracking details for customer response for survey