Yahoo!, eBay, PayPal team for anti-phish push
Users of Yahoo! Mail should start to see fewer phishing attempts targeting their eBay and PayPal accounts.
Yahoo Mail is today applying the DomainKeys authentication technology to block emails purporting to be from eBay or PayPal.
DomainKeys allows an email server to verify that an email really did originate from the domain it claims to be from. So a phishing email coming from a zombie PC connected to an ISP cannot include a valid signature to confirm it came from PayPal.
Once a domain declares it will add a DomainKeys signature to all outgoing emails, the operators of other email servers and services can choose to ignore any emails that purport to be from that domain but which do not include a verified signature.
Full article: itwire.com