can formail -D be used with other headers?

Can formail -D be used with other headers, like checking In-Reply-To:
or References: against an Message-ID: idcache?

        Thanks,

        John

-- 

John Conover, conover(_at_)rahul(_dot_)net, http://www.rahul.net/conover/

_______________________________________________
procmail mailing list
procmail(_at_)lists(_dot_)RWTH-Aachen(_dot_)DE
http://MailMan.RWTH-Aachen.DE/mailman/listinfo/procmail