user selection for replication

Hi,

I am running a setup where I have a multitude of users. Usernames are formed in both user-domain.tld and user@domain.tld. One to be able to login with the @ account to dovecot / webmail etc and the - account to be able to deliver email to it.

Virtualmin does it like that for example.

This is fine for logging in to accounts and telling postfix via lmtp which users are valid. But I do not want the - AND @ account to both synchronise.

How can I select which users can replicate and then ideally like I can do in ldap ‘uid=*@*’ for example?

Thanks Remko