Unroll.me doesn’t have an account system. Currently (May 2013) you can use some of the 3rd party mail sites such as Google and Yahoo. However it seems not even a permanent right to login in via those is made, it’s only once. So no deletion is required. By the way: cool service! Recommended for unsubscribing from whatever mail subscriptions. It fits in the service type provided by XYZ too: getting rid of things. ?
URLS:
http://www.unroll.me/