A method, apparatus, system, and user interface are provided for managing e-mail rules and alert subscriptions from multiple sources. Alert messages and persistent state objects, such as cookies, are examined to determine whether they relate to an alert subscription. If an e-mail message or persistent state object is determined to relate to an alert subscription, a network address for a subscription source identified by the contents of the e-mail message or state object are added to a list of subscription sources. A request may then be received to manage one or more alert subscriptions. In response to the request, each subscription source identified in the list of subscription sources is validated. Each validated subscription source is added to a current subscriptions list, which is displayed to a user. Each subscription in the current subscriptions list may be modified or deleted by the user through a unified user interface for managing e-mail rules and alert subscriptions. Schema and data structures are also provided for communication between an e-mail and alert subscription client and a subscription source.