eBay and PayPal have worked hard to ensure that all their email is signed with DomainKeys and DKIM. Armed with this information, Gmail can now easily reject as a fake anything that doesn't authenticate. Gmail team has announced that by working with eBay and PayPal, we're one step closer to stopping all phishing messages in their tracks.
Now any email that claims to come from “paypal.com” or “ebay.com” (and their international versions) is authenticated by Gmail and -- here comes the important part -- rejected if it fails to verify as actually coming from PayPal or eBay. That's right: you won't even see the phishing message in your spam folder. Gmail just won't accept it at all. Conversely, if you get an message in Gmail where the “From” says “@paypal.com” or “@ebay.com,” then you'll know it actually came from PayPal or eBay. It's email the way it should be.