Yahoo! Mail accounts come in two flavors: premium and free. The Yahoo! Mail Web Service limits the functionality for free accounts. Premium accounts have no such limits. To get the user’s account type from the web service, call the GetUserData method.
Premium users may access any part of the web service. There are no restrictions. Premium Yahoo Mail account types include Yahoo! Mail Plus and broadband Yahoo! Mail accounts (such as @sbcglobal.net accounts). Yahoo! Business Email and Yahoo! Custom Mailbox accounts do not currently work with the Yahoo! Mail Web service.
Premium users may access any part of the web service. There are no restrictions.
Non-Premium users are restricted to the following APIs:
| ListFolders | ListMessages | MoveMessages | DeleteMessages |
| GetUserData | CreateFolder | EmptyFolder | BatchExecute |
| FetchExternalMail | RemoveFolder | RenameFolder |
Calls to other APIs will return an error. To upgrade to premium, go to http://mailplus.mail.yahoo.com. For information on how to receive a commission for upgrading users to a premium Yahoo! Mail Plus account, see the Yahoo! Mail Web Service page on the Yahoo! Developer Network.
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