the qmail-smtpd RBLID
patch is against a vanilla qmail-1.03.
it takes the contents of the RBLID
environment variable and inserts
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.