A computer-implemented system and method for providing a legitimacy rating of a content source are provided. A request for a document is received. An electronic document associated with a content source is passed by a document provider in response to the request. A legitimacy rating of the content source is passed. Examples of legitimacy rating information include, for example, a history rating of the content source based on the length of time the document provider has published documents associated with the content source and a transaction volume rating of the content source based on the number of electronic documents associated with the content source that are passed by the document provider.