1. A computer implemented method for performing email analytics on a configured email repository, the computer implemented method comprising: grouping, by a processor, emails in the configured email repository, into a plurality of mail groups based on identifying similarity of content in the emails, wherein each of the plurality mail groups is associated with a timeline; determining, by the processor, a network graph for each of the plurality of mail groups based on a header information of emails within each of the plurality of mail groups, wherein the network graph indicates an association of the emails in the plurality of mail groups; and performing, by the processor, email analytics on the plurality of mail groups, wherein the performing includes: clustering, by the processor, the plurality of mail groups into a plurality of mail clusters based on a temporal analysis of the emails within each of the email groups, wherein the temporal analysis identifies a temporal progression of the emails over the timeline of each of the plurality of mail groups; determining, by the processor, key phrases from content of emails in the plurality of mail groups in each of the plurality of mail clusters; and associating, by the processor, the key phrases with the network graph of each of plurality of mail groups, wherein the key phrases are indicative of type of activity and state of activity in each of the plurality of mail groups.