While Garlinghouse acknowledges that sender authentication won't stop spam completely, he sees DomainKeys as a means to restore consumer trust. He says that once "we actually have credibility and confidence that the E-mail that said it came from Yahoo.com actually did come from Yahoo.com, we then can use other intelligence and filters ... so that an individual user can, with confidence and effectiveness, determine what actually ends up in his or her in-box."
Yahoo is already fighting spam on other fronts. In April, it formed an anti-spam alliance with America Online and Microsoft, to which it remains committed.
As for partners planning to implement DomainKeys, Garlinghouse expects some announcements soon. The software, he says, "is a very neutral solution that doesn't king-make one player. By making it easy for people to adopt a low-overhead, low-cost, highly credible deterrent to spam in the in-box, we're optimistic that we'll have some partnerships as we move forward."
Gillis sees the proposal as a positive step but cautions there's much left to do. "If this technology is adopted, it would be a great battle won in the war on spam, but the war is still far from over," he says. "While this would prevent spammers from imitating trustworthy senders, it does nothing to really limit the spam being legally sent from self-avowed spammers. The next step will be to determine how to stem the flow of spam from authenticated sources."