Yahoo! Mail
Yahoo! Mail is an email service launched in 1997 through the American parent company Yahoo!. Yahoo Mail provides four different email plans: three for personal use (Basic, Plus, and Ad Free) and another for businesses. By December 2011, Yahoo! Mail had 281 million users, making it the third largest web-based email service in the world. Since 2015 its webmail client also supports managing non-Yahoo e-mail accounts.
Yamanner
The Yamanner worm is a computer worm written in javascript that targeted a vulnerability in the Yahoo! Mail service. Released on June 12, 2006, the worm spread through the Yahoo! system, infecting the systems of those who opened the e-mails and sending the user's address book to a remote server.