8. An email analytics system for performing email analytics on a configured email repository, the email analytics system comprising: a processor; a mail reconstruction module coupled to the processor to: group 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; and determine 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 emails in the plurality of mail groups; and an email analytics module coupled to the processor to perform email analytics on the plurality of mail groups, wherein the email analytics module performs the following: cluster 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 by computing activity density distribution of each of the plurality of mail groups and wherein the plurality of mail clusters are plotted as activity density distribution graphs; determine key phrases from content of emails in the plurality of mail groups in each of the plurality of mail clusters; and associate 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 of each of the plurality of mail groups.
8. An email analytics system for performing email analytics on a configured email repository, the email analytics system comprising: a processor; a mail reconstruction module coupled to the processor to: group 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; and determine 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 emails in the plurality of mail groups; and an email analytics module coupled to the processor to perform email analytics on the plurality of mail groups, wherein the email analytics module performs the following: cluster 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 by computing activity density distribution of each of the plurality of mail groups and wherein the plurality of mail clusters are plotted as activity density distribution graphs; determine key phrases from content of emails in the plurality of mail groups in each of the plurality of mail clusters; and associate 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 of each of the plurality of mail groups. 10. The email analytics system as claimed in claim 8 , wherein an email extraction module is coupled to the processor to extract emails from the configured email repository for grouping the emails into the plurality of mail groups.