Systems and methods for displaying electronic messages are disclosed. In one aspect, a method is performed at a computing device. The method includes: (1) receiving a plurality of electronic messages; (2) assigning a first subset of the messages to a predefined group category based on a set of content-based clustering rules and content in respective bodies of the messages; (3) concurrently displaying a second subset of the messages and a cluster graphic corresponding to the predefined group category, where the cluster graphic includes a label that describes the predefined group category; (4) while concurrently displaying the second subset of electronic messages and the cluster graphic, receiving user selection of the cluster graphic; and (5) in response, displaying a plurality of messages in the predefined group category, including displaying at least one message from the first subset of messages.