The book provides a thorough step-by-step instructions on building POP3 client in C#. It covers various aspects of managing and retrieving email messages via POP3 session - connectivity (including secure connection), authentication, session states, mailbox stats. Several chapters are dedicated exclusively to mail message format, message parsing, mail headers, MIME types and encodings (Base64 and Quoted-Printable). Also covered are email and POP3 history, terminology, standards. Sample POP3 session via Telnet is reviewed in depth.