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

       /FLAG=keyword
       /NOFLAG

    Controls whether a flag page is printed preceding a message. The
    /FLAG qualifier can take either of two keywords: ALL or ONE. The
    ALL keyword indicates that each file in the job is preceded by
    a flag page. The ONE keyword indicates that a flag page applies
    only to the first copy of the first file in the job.