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Yahoo Mail Applications API - Developers

Use the Yahoo Mail Applications API to create apps that extend Yahoo Mail. Part of the Yahoo Application Platform, YAP. Developers can embed a JavaScript application inside an iframe running inside Yahoo Mail. Functionality includes: register callbacks to get notified when messages are dropped onto your app, create new messages with app-generated content, and integrate social data from the Yahoo network using YQL. Developers can also call out to their own or a third party’s web services, optionally using OAuth or a Flickr-style signed-call-home for authentication.