Prior Art for Hyperlink Order Tracking in Email?

Davesbud asks: "I'm trying to invalidate a patent that claims to have invented 'placing a hyperlink in an email which in turn provides the recipient with order status or tracking information.' I am searching for any web pages, articles, newsgroup/forum discussions, brochures or the like, published before December of 1997, that describes this idea. You've seen this if you've ordered almost anything online or shipped by FedEx or UPS. Any info would be appreciated. Thanks."