[Dovecot] Direct groups of users to pairs of backend servers

Hi All,

I am using dovecot in the Director setup with multiple proxy and backend mailstores and user information stored in LDAP.  I am aware users can be directed to a single backend server.  It would be useful to be able to direct groups of users to pairs of backend servers to give some fault tolerance against NFS issues and make the whole thing more scalable.    Otherwise each backend mailstore will need all the NFS mounts and the whole cluster will be affected if one NFS mount has an issue.  I am not sure if this possible with the current dovecot implementation?  If not it would be a great enhancement.

Thanks

Murray