what changes do i need to make to the local.cf site-wide configuration if I am putting the SURBL zone files into my DNS?
Am i right in saying that i really dont need to make much change (to SA) other than configuring the dns to act as a secondary to the surbl's dns??
To SA, the difference is irrelevant. SA just queries via the normal resolver, it doesn't care if the zones are locally hosted or not. Just make sure your /etc/resolv.conf points to a local DNS resolving server that actually has those zones slaved, or the transfer is more-or-less moot.
However, be sure that you've got your secondary setup done properly. Don't configure your DNS server to zone-transfer the SURBL zones without approval from the operators.
I know they generally prefer rsync transfers and have a form to request that service:
http://www.surbl.org/rsync-signup.html
If you've already done all that, then good job!
