On Wed, Jul 16, 2014 at 03:39:49AM -0000, John Levine wrote: > >Is there quantitative evidence that preventing spoofing of the > >"From" address reduces the efficacy of phishing? > > According to people I've talked to at large mail providers, apparently > so. DMARC blocks a lot of mail that is clearly phish. That's not the question I'm asking. Spamhaus RBLs, also block lots of mail that is phish. The real question is whether the incidence of successful phishing attacks is reduced. > I would have thought that phishers would use any of the bazillion > obvious ways to circumvent DMARC, but they must be as lazy as anyone > else. Which means that perhaps they don't need to bother, because they are getting sufficient response rates? -- Viktor.