1. A method of processing communication in a computer network, comprising: accessing information related to requests from a plurality of clients for a plurality of domains, the information including for each client a list of domains associated with requests from the client and including for each domain a list of clients associated with requests for the domain; generating security rankings for the plurality of clients based on a predetermined classification of a first set of the plurality of domains, wherein the security ranking for each client is determined from the list of domains associated with the client; generating security rankings for the plurality of domains based on the security ranking for the plurality of clients, wherein the security ranking for each domain is based on the security rankings of the list of clients associated with requests for the each domain; and generating a domain classification for a second set of the plurality of domains based on the security rankings of the second set of the plurality of domains.