One or more messages may be selected and grouped and one or more group-level actions may be initiated for the group, such that the group-level action is performed on each message in the group. Each message in a group shares the at least one attribute value. A messaging user interface may comprise a listing of the set of messages and a message group display portion that displays one or more message groups and a group-level toolbar comprising a selectable indicator for each group-level action. A message, or messages, shown in a message list portion of the user interface may be selected from the message list based on similarity of the message(s) to previously selected messages, and the selected message(s) may be grouping based on shared attribute values. The messages belonging to a group may be modified in the same way via a single action taken on the group.