We have several different ID types.

• Yahoo! ID (this will end with @yahoo.com)
• Rocketmail (this will end with @rocketmail.com)
• Ymail (this will end with @ymail.com)

For users that register a ymail.com or a new rocketmail.com account, your Yahoo! ID will be your full email address which contains the @ character. If you have registered a yahoo.com account, your ID will not contain the @ character.

Partner Domains: Yahoo! has relationships with some partners where the Yahoo! ID is also an email address in a domain belonging to a partner. For example, customers have Yahoo! IDs ending in @yahoo.com that they need to type at login.