Electronic messages, such as email messages, may be classified according to classification rules by a client application operating on a client device. Messages may be classified according to whether and how they are to be displayed in various user interfaces of the client device. A centralized classification service may maintain a centralized and dynamic rules ledger having aggregated rule entries for a group of users. The centralized classification service may update the dynamic rules ledger based on receiving and aggregating user classification preferences received from client devices. The dynamic rules ledger may be used to automatically enable, disable, and/or edit classification rules on one or more client devices.