If configured, Kopi can add a browser link to every mail that when clicked on, will take you to the Kopi application. Using the message link, you can stop that forwarder from allowing mail delivery, re-direct mail to an rss feed or see what other addresses have send messages to that address.
The “add link to mail” functionality is disabled by default.
You can enable this feature from the “Home” screen. You can get there by selecting “Home” in the menu, or clicking the Kopi icon in the top left corner.
You can see an example of the link in action in the original blog post announcing the feature: "One touch" blocking now available