Ajuca

Este HowTo le permitirá configurar un servidor de correo Postfix con el alojamiento virtual. Alojamiento virtual, significa que usted puede añadir tantos como maildomains quiera y consecuentemente tantos buzones de correo para estos dominios como desee. Aquí usamos un backend LDAP para el MTA Postfix) y servidor POP3/IMAP Dovecot), y una interfaz de gestión basada en web. This how to will allow you to configure a Postfix mail server with virtual hosting. Virtual hosting means that you can add as many maildomains as you want and subsequentially as many mailboxes for these domains as you want. Here we we use an LDAP backend for both the MTA Postfix) and POP3/IMAP server Dovecot), and a web based management interface.

http://www.howtoforge.com/postfix-virtual-hosting-with-ldap-backend-and-with-dovecot-pop3-imap-on-ubuntu-8.10