Phishing emails pretending to be from PayPal and eBay will be blocked from Yahoo mail inboxes.

The DomainKeys system will weed out phishing emails before they reach a Yahoo mail user's inbox.

The move should help stamp out common phishing scams using the PayPal and eBay names, said PayPal chief information security officer Michael Barrett.

"While there is clearly no silver bullet for solving the problems of phishing and identity theft, today’s announcement is great news for our customers who rely on Yahoo Mail," he said.

The technology allows internet service providers to determine if messages are authentically from Paypal and eBay by using special identifiers.

It will be rolled out globally over the next several weeks to all users of Yahoo Mail.