Response IDs
A response ID contains outbound tracking information, including the business partner, mail form, and campaign. Response IDs are GUIDs.
Response IDs are not visible in personalized mail. For this reason, response IDs are normally only useful when you are sending Internet mail.
If a business partner responds to personalized mail, the system reads the response ID of this inbound mail.
You can insert response IDs in text elements.
You insert a response ID in your mail form. The system generates the GUID when you send the personalized mail.