A method comprises identifying one or more relationships between a target individual and one or more persons based at least in part on a plurality of emails. The plurality of emails comprise one or more outbound emails, which may comprise emails sent to the target individual from the one or more persons. The plurality of emails further comprise one or more inbound emails, which may comprise emails sent from the target individual to the one or more persons. The method further comprises, for each of the one or more relationships, calculating an amount of outbound emails and an amount of inbound emails. The method further comprises assigning a classification to each of the one or more relationships based at least in part on the amount of outbound emails and the amount of inbound emails. The method further comprises sorting the one or more relationships based at least in part on the classification assigned to each of the one or more relationships. The method may further comprise storing information regarding the sorted relationships.