1. A system comprising: an email server configured to: generate a topic map of email messages stored on the email server, the topic map indicative of a frequency of a topic being in email messages received or sent by a user with an account on the email server; generate an author map of users with accounts on the email server, the author map comprising connections between pairs of the users with accounts, each connection being assigned a weight based on a frequency of communication between the users associated with the connection; receive an email message from an author, the email message directed to a receiver; determine a relevance score of the email message with a third user based on the frequency of a topic of the email message associated with respect to the third user and the weight of the author map connection between the author and the third user; and send an alert message associated with the email message to an email client of the third user in response to the relevance score being greater than a predetermined threshold.
1. A system comprising: an email server configured to: generate a topic map of email messages stored on the email server, the topic map indicative of a frequency of a topic being in email messages received or sent by a user with an account on the email server; generate an author map of users with accounts on the email server, the author map comprising connections between pairs of the users with accounts, each connection being assigned a weight based on a frequency of communication between the users associated with the connection; receive an email message from an author, the email message directed to a receiver; determine a relevance score of the email message with a third user based on the frequency of a topic of the email message associated with respect to the third user and the weight of the author map connection between the author and the third user; and send an alert message associated with the email message to an email client of the third user in response to the relevance score being greater than a predetermined threshold. 2. The system of claim 1 , wherein the topic associated with the email message is based on analysis of text of the email message.