[Mailman-Users] Mailman, Postfix & virtual domains

[Aranel Doriath]

Hi all. 
I have Centos 5.5 server with Postfix, configured to work in AD, and i want to add the mailman aliases:

main.cf:
virtual_alias_maps = ldap:/etc/postfix/ldap-groups.cf, ldap:/etc/postfix/ldap-groups2.cf, hash:/etc/postfix/valias

/etc/postfix/aliases looks like:
mailman at pmz.local              "|/usr/lib/mailman/mail/mailman post mailman"

But i recieved this:

"|/usr/lib/mailman/mail/mailman post mailman"@melchior.kolos.local> (expanded from <mailman at pmz.local>): unknown user: "|/usr/lib/mailman/mail/mailman post mailman" 

How can i connect Mailman to Postfix? 
P.S. Sorry for my English :)