Well both postfix and dovecot need to have users that can access port 389
on samba server. Samba is running its own ldap server just like server
2008/2012 domain controller. I would recommend creation of user that can
access ldap on samba and it would read user names. You can test with
administrator but what are the security risks. I have samba running as
domain controller and openchange.
I had followed archlinux wiki on openchange it explains it well the steps
as does sogo wiki
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