por casualidad creaste los alias de las listas? y si los creaste en el fichero /etc/aliases, sabes si postfix lee ese fichero buscando los alias?
quizas nos sea mas util para ayudarte que pases algunos datos de la configuacion del postfix
en mi main.cf tengo estas referencias
alias_maps = hash:/etc/aliases, hash:/etc/mailman/aliases
virtual_alias_maps = proxy:mysql:$config_directory/mysql_virtual_alias_maps.cf hash:/etc/aliases hash:/etc/mailman/aliases hash:/etc/mailman/virtual-mailman
este es el contenido de /etc/mailman/aliases
# This file is generated by Mailman, and is kept in sync with the # binary hash file aliases.db. YOU SHOULD NOT MANUALLY EDIT THIS FILE # unless you know what you're doing, and can keep the two files properly # in sync. If you screw it up, you're on your own.
# The ultimate loop stopper address mailman-loop: /var/lib/mailman/data/owner-bounces.mbox
# STANZA START: cinco # CREATED: Wed Jan 23 12:13:23 2008 cinco: "|/usr/lib/mailman/mail/mailman post cinco" cinco-admin: "|/usr/lib/mailman/mail/mailman admin cinco" cinco-bounces: "|/usr/lib/mailman/mail/mailman bounces cinco" cinco-confirm: "|/usr/lib/mailman/mail/mailman confirm cinco" cinco-join: "|/usr/lib/mailman/mail/mailman join cinco" cinco-leave: "|/usr/lib/mailman/mail/mailman leave cinco" cinco-owner: "|/usr/lib/mailman/mail/mailman owner cinco" cinco-request: "|/usr/lib/mailman/mail/mailman request cinco" cinco-subscribe: "|/usr/lib/mailman/mail/mailman subscribe cinco" cinco-unsubscribe: "|/usr/lib/mailman/mail/mailman unsubscribe cinco" # STANZA END: cinco
y este el de /etc/mailman/virtual-mailman
# This file is generated by Mailman, and is kept in sync with the binary hash # file virtual-mailman.db. YOU SHOULD NOT MANUALLY EDIT THIS FILE unless you # know what you're doing, and can keep the two files properly in sync. If you # screw it up, you're on your own. # # Note that you should already have this virtual domain set up properly in # your Postfix installation. See README.POSTFIX for details.
# LOOP ADDRESSES START mailman-loop@xxx.yyy.ab mailman-loop
# STANZA START: cinco # CREATED: Wed Jan 23 12:13:23 2008 cinco@xxx.yyy.ab cinco cinco-admin@xxx.yyy.ab cinco-admin cinco-bounces@xxx.yyy.ab cinco-bounces cinco-confirm@xxx.yyy.ab cinco-confirm cinco-join@xxx.yyy.ab cinco-join cinco-leave@xxx.yyy.ab cinco-leave cinco-owner@xxx.yyy.ab cinco-owner cinco-request@xxx.yyy.ab cinco-request cinco-subscribe@xxx.yyy.ab cinco-subscribe cinco-unsubscribe@xxx.yyy.ab cinco-unsubscribe # STANZA END: cinco