A method for annotating a message executes at a computing device having one or more processors and memory. The memory stores one or more programs configured for execution by the one or more processors. A plurality of messages for a user is analyzed to determine whether a task reminder is derivable for any of the messages. In this way, task reminders are derived for at least a subset of the messages. A user interface for an electronic messaging application is provided. The interface includes a list of objects, one or more of which represents a collapsed state of a message in the message subset and comprises a summary, task reminder, and a dismissal affordance. Responsive dismissal affordance selection, the task reminder and the dismissal affordances are removed from the object.