I was looking in a couple of Spam-related plugins for WHM/cPanel in the summer of 2010. After some digging and trial runs I decided to buy a licence of “ASSP Deluxe”, which is essentially an integration script + UI for WHM wrapped around the opensource scripts in the ASSP package (Anti Spam SMTP Proxy). So far I’m really pleased with the results. On the current config, it catches close to 99.5% of all spam on my adresses with a couple of false positives (like 1-2 per week). Those false positives are mostly poorly engineered newsletters or notification mails from webservices etc.
I was looking for a solution which keeps admintasks low and doesn’t need constant monitoring. Means, simple/stupid “set and forget”. This is mostly the case with ASSP Deluxe – I’ve only had to fix 1-2 things in the past 6 months which is OK with me. The cool thing was that the problem and a link to the solution was right inside the UI. The link leads you to the support pages of the developer and there are step by step instructions to fix everything back to normal. The integration with WHM works smooth, Gabriel (the guy behind ASSP Deluxe) was setting up everything on my WHM box remotely, so I didn’t had to worry about messing up the conf.
The performance of ASSP depends heavily on configuration. You can go very deep with that. But compared to SpamAssassin which comes with WHM per default, ASSP performs a lot better. It might very well be that you can get there with SA aswell, but that will require some serious config tweakin’ – which is what I don’t have time for.
All in all, it was really worth the (actually rather inexpensive) licence. One less thing to worry about. :-)