1. A method performed by one or more computer devices, the method comprising: identifying a set of related documents; identifying one or more documents, in the set of related documents, that are sources of redirects; identifying organizations that are targets of the redirects; determining a redirect score based on a number of the identified documents that are sources of the redirects; determining a spam score based on a number of the organizations that are targets of the redirects; determining whether to classify the set of related documents as a bounce pad based on the redirect score and the spam score; and storing information associated with a result of the determination of whether to classify the set of related documents as a bounce pad.