rbldnsd and bind

[Ken Anderson (Pacific Internet)]

Hi,
I'm running rbldnsd on an antispam machine processing lots of mail that 
is also running a caching bind nameserver. Sendmail does reverse lookups 
using bind, and SpamAssassin also uses bind for rbl lookups. But I also 
need to serve the sbl-xbl.spamhaus.org blacklists from rbldnsd on the 
same machine. Currently, this works by bind forwarding the zone to to a 
different port where rbldnsd is listening.

This works okay, but SpamAssassin would be quicker if it could talk 
directly to rbldnsd without having to hit bind and then be forwarded to 
rbldnsd for the rbl check.

SpamAssassin uses perl Net::DNS to do rbl lookups, so I don't think 
there's anything on that end I can do - there's no way to specify an 
alternate port for DNS lookups.

Any ideas how to get SpamAssassin to go straight to rbldnsd for a 
particular zone?

Thanks,
Ken A