When accessing mail locally, the Pine Expunge command moves all
    messages marked for deletion to the VMS MAIL WASTEBASKET folder.
    In addition, it performs the equivalent VMS MAIL PURGE command
    only when your VMS MAIL profile allows for AUTO_PURGE. If you
    have set NOAUTO_PURGE, then the deleted messages are left in the
    WASTEBASKET folder. However, should you expunge the WASTEBASKET
    folder, then the VMS MAIL PURGE function will be performed.
    Purged message space is not available for reuse until a reclaim
    operation is performed. When the amount of deleted message space
    in the mail file exceeds 32,767 bytes, a reclaim operation is
    automatically done by the Expunge command.

                                   NOTE

       Pine never compresses your mail file.