lines in the header of the message for every (whitespace separated) rblid found in the RBLID environment variable.
this modification has also been incorporated in qmail-ldap thanks to Henning Brauer. For more information see the qmail-ldap documentation.
RBLID="MAPS-RSS MAPS-DUL ORBS"
would result in the following lines inserted in the header:
this can be used together with my 822xrblcheck package and my rblsmtpd tagging addon to tag messages and allow users to reject messages that have specific RBL ids from within a .qmail file.