1. A method for processing and producing email documents, the method comprising: receiving, by a processor, information organizing a first plurality of email documents into a plurality of document groups; generating, by the processor, a graphical user interface for reviewing a document group from the plurality of document groups, the document group including a second plurality of email documents from the first plurality of email documents that are organized into the document group, wherein the second plurality of email documents represent an email thread, and wherein the graphical user interface comprises a first section displaying the document group and a second section to receive a plurality of review content to associate with each of the second plurality of email documents or to associate with each of the email documents of other document groups from the plurality of document groups based on a selection from the second section of the graphical user interface; receiving, by the processor, the plurality of review content comprising one or more annotations provided by a user of the graphical user interface that are applicable to the document group; associating, by the processor, the plurality of review content with the document group; for each review content of the plurality of review content: determining, by the processor, a propagation for the review content to the second plurality of emails, and propagating, by the processor, the review content to the second plurality of email documents based on the determined propagation for the review content, wherein the review content is propagated to each email document in the second plurality of email documents, or the review content is propagated to a subset of email documents in the second plurality of email documents, and wherein one or more of the email documents of the second plurality of email documents comprises at least one multiply annotated email document that is associated with the plurality of the review content and is annotated based on an aggregation of the plurality of review content; and producing, by the processor, a third plurality of email documents from the first plurality of email documents in response to one or more queries related to the one or more annotations in the review content that has been propagated, the third plurality of email documents including at least one email document from the second plurality of email documents in the document group.