Automatic sorting and grouping of electronic mail items in an electronic mail system is provided. An automatic mail grouping property may be selected for electronic mail received, sent or stored in a variety of storage folders. For a given mail location (e.g., received mail, sent mail, or a given mail storage folder), a selected automatic grouping property causes mail to be displayed to a user in one or more categories that make location of specific mail items easier and more efficient. Visible dividers with optional headings may be provided between mail categories to quickly draw a user's attention to a given mail category and to separate large numbers of mail into logical groupings that make location of specific mail items more manageable.