I disagree. Looking at just a random spam I have here, I see it passed both SPF and DKIM happily. But it was marked as spam in HostKarma, Spamhaus, Truncate an

I disagree. Looking at just a random spam I have here, I see it passed both SPF and DKIM happily. But it was marked as spam in HostKarma, Spamhaus, Truncate and flagged as Bulk by Razor. So I dropped it. Looking at heaps of my attempted Spam emails I see the same. It seems most spammers setup SPF before attempting, or are hijacking legit sites/mailservers to send the spam. Pretty much the only Spam I find I reject based on DMARC as well is just the "I hacked your webcam" blackmail spam that tries to "prove" they hacked you by spoofing my email domain. I think if I disabled all RBLs the other huristics rspam gives me would still catch 90% of the Spam, but the RBLs certainly help me still catch 99.9% of the Spam attempts I recieve.