Is there a way to set the 'unsubscribe' link in an email to point to a page on the customer's website than Exact Target's profile center? On this web page, the idea is to determine the user's email address/subscriberkey through some query string parameter, fetch the lists that the user is subscribed to (I got this part using SOAP API), have him select which ones he wants to unsubscribe from and click the submit button to unsubscribe (I got this part also through the SOAP API). The part where I need help is how to change the unsubscribe link in the emails and how to add the emailaddress in the query string? Or is there a way to decode the query string parameter qs='xxxxxxxxxx' which gets included by default, and determine the user from that? Any help will be greatly appreciated.