Users of webmail systems like GMail, Yahoo, etc. are accustomed to having a “Mark as Spam” button in the interface. Clicking the button tells the server that the selected message is spam, to prevent similar messages from showing up in the inbox again. So how can administrators of standard cPanel-based hosting systems provide similar functionality?
I’ve written up some techniques you can use to let desktop mail client users train server-side mail systems about what’s spam and what’s ham.
Update: I’ve since stopped trying to train Bayes databases through this system, as I’ve discovered the incredibly effective Barracuda RBL. I’ve written that up here.