Found it: http://www.dovecot.org/list/dovecot/2010-August/051946.html
It would be great if director include it self this feature.. best regards 2010/11/16 Aliet Santiesteban Sifontes <alietsantieste...@gmail.com> > Hi people, I know I saw this at some point in the list but can't find it, I > need a script wich monitor the health of the email backend and if a node > fails remove it from the director server, once is up again add it, I plan tu > run the script at the load balancer, if you have some let me know.. > thank's in advance >