USEINTL <intlspec> (Auto)
        <intlspec> =
            Auto : Only insert in inter-zone netmail.
            Yes  : Always insert.
            No   : Never insert.

        The INTL kludge is normally only inserted in netmail, if the
        origination zone is different from the destination zone
        (Auto), but on systems with many AKA's in the mailer, it might
        be useful/nescessary to add it ALWAYS (Yes). The (No) option
        should never be used. NOTE: Some netmail processors can be
        confused by the INTL line, if it contains the same orig/dest
        zone, especially in conjunction with points and the FMPT/TOPT
        kludges.