Comment Re:Not much to do (Score 1) 459
enec is 100% right. 99.99% of all port 25 traffic from cable modems is from spambots running on compromised PCs. Comcast, AOL, et al. will never again accept email from address blocks that represents non-commercial users or cable modems, no matter what things you try, static IP, DKIM, SPF or white listing.