Enabling users to take full advantage of the Exim system, this practical reference provides an essential resource for e-mail administrators, designers, or implementers of network applications. Included are instructions to deploy Exim as the SMTP email server throughout an organization, configure a reliable mail service to meet the specific needs of the site, tune the server to give optimal performance in the environment, as well as secure an e-mail system to prevent unauthorized use and maintain the confidentiality of messages.