Robert Brooks wrote:

I couldn't find any way of using a dns blacklist such as sc.surbl.org as a squid acl, has anyone done this?

I use some perl scripts "wroten by myself" to block some URLs. This was done not to block some kind of sites, but to replace some image ads by locally stored transparent gif images (pub removal... ). I use redirector.

It's used with a locally stored URL database, but it surely may be adapted to a DNS based database - but this gives some latency, as mail flow doesn't interact with users in real time.

It's much easy to implement : less than a hundred lines of code. If there is some interest, I'll post it here.

Best