For sending mail via SMTP, the remote clients just use the external (public) address of the main mail routing server (guest01).
For receiving mail, you will need to either:
* configure a load-balancer/proxy server in Guest01 that will proxy the connections to Guest02, Guest03, etc, based on the username. How you do this depends on which IMAP/POP server you are using (Cyrus IMAP uses MURDER, Zimbra uses a custom proxy, not sure what Courier or Dovecot use).
Or,
* you will have to tell each user which server their mail account resides on, and they will have to configure their mail clients accordingly.
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