eBay, PayPal and Yahoo announced a collaborative effort to fight phishing email scams. Yahoo Mail will begin using DomainKeys email authentication technology, which Yahoo developed, to block malicious messages for eBay and PayPal.

Yahoo, eBay and PayPal are in the process of transitioning their systems from DomainKeys to the proposed standard DomainKeys Identified Mail, and implementation is expected to be complete in the coming months. eBay and PayPal customers worldwide using Yahoo Mail will begin receiving fewer fake emails claiming to be sent by eBay and PayPal, the companies said.

Michael Barrett, the CISO for PayPal, announced the news on the PayPal blog. He said eBay and PayPal are working with about half a dozen large Internet service providers around the world to implement similar technology, and he warned users to remain vigilant.

"As I've said before, security on the Internet is a classic arms race, and the criminals are always looking for ways to get around everything we do to protect you. For that reason, I still encourage you to follow all of the general safe e-mail rules regardless of whatever e-mail provider you choose - don't click on links in e-mail, don't provide personal or financial information in response to e-mail, and don't download attachments in e-mail."

http://www.thepaypalblog.com/weblog/2007/10/yahoo-paypal-an.html