Library /sys$common/syshlp/mailhelp.hlb PRINT, Qualifiers, /PRINT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The /PRINT qualifier is synonymous with the /NOW qualifier.
    Releases all messages previously queued with the PRINT command
    to the print queue. If you do not specify the /PRINT qualifier,
    messages are not released to the print queue until you exit
    from Mail. PRINT/PRINT does not queue the current message for
    printing. Also note that the only other qualifier you can specify
    with /PRINT is /NOTIFY.