A method of efficiently generating and sending emails including creating an email template, setting up a campaign query, and distributing the email template and a set of information associated with the campaign query to a plurality of server groups. The method also includes running the campaign query on each of the plurality of server groups and obtaining a plurality of matching users; dividing the plurality of matching users into one or more batches; merging the email template with a set of information corresponding to each of the plurality of matching users from a first batch for each of the plurality of server groups, and sending the first batch of the merged emails directly from each of the plurality of server groups without saving copies of the merged emails.