Here's the problem. Affiliate of ours started spamming his link everywhere. Now, these spammy website all point to my domain's default page with this affiliate id parameter attached. Until I started doing SEO for this site, google was indexing these parameters... now his affiliate link (with parameter) is posted on these damn spam sites and they're posting to my domain.
I'm 100% convinced its negatively affecting my domain trust and authority. How can quickly, and effectively, send them to a 404 before my server returns anything. (Right now, I've 301ed everything with the affid parameter to a page that I intentionally haven't made so it hits a 404 - which is a pretty useful 404 page).
Any other ideas?