In organizations of all sizes, 24/7 access to email has become an indispensable part of the enterprise. Yet providing the myriad of mail-related services expected by users these days can be a confusing, often daunting process. Pro Open Source Mail: Building An Enterprise Mail Solution removes the cloak of secrecy often surrounding mail administration by presenting a comprehensive guide to managing the most important services, including user administration, mail transfer agents, virus protection, spam filtering, mail filtering, Web-based mail, and mailing list maintenance. Beginning with installation and configuration of one of the most popular server-based operating systems, the Fedora Core, readers are presented with a detailed overview of the system and network preparation process geared towards running an enterprise mail server. Subsequent chapters are devoted to installing and configuring Sendmail, popular POP3/IMAP servers Qpopper and Dovecot, and a variety of mainstream open source software commonly used for managing not only desired but required features such as virus protection and spam filtering. In a nod to the global mail availability required by today's organizations, readers are also guided through the configuration of a Web-based mail interface and mailing-list software.