2 Postfix Mail Server

Describes the message flow and configuration of a mail server based on the Postfix mail transfer agent. The basic mail routing scheme is Postfix receives incoming messages and funnels them through a Amavis/Clam AV/Spam Assassin proxy where they are scanned for scanned for spam and malware. Clean messages are then passed along by Postfix to a Cyrus LMTP delivery agent and Cyrus IMAP mail store.

Two alternate recipient verification scenarios are examined. In the first, the Postfix server performs recipient verification prior to malware processing. In the second, Cyrus performs primary recipient verification just before mail is delivered to virtual recipients.

Transfer Agent Considerations