9.4 Purge <Alt-P>

     The options on the Purge menu allow you to remove one or more
     messages, in the current folder, based on the various criteria,
     as described below.

     From user       Purge all messages FROM the specified user.

     To user         Purge all messages TO the specified user.

     From net address
                     Purge all messages that originated from the
                     specified address.

     To net address  Purge all messages destined for the specified
                     address.

     Received        Purge all received (read) messages.

     Age             Purge all messages older than the specified date.