I’d also would like to know this. I currently use an AV suite with an integrated Antispam solution. I want to migrate to CIS but it doesnt include an antispam module.
I had take a look to CAS, but it doesn’t seem to be in development anymore. Am I wrong?
EDIT: Yes, I’m wrong, development is still on going, just really slow apparently. I hope to see a new/better/working version soon.