Using as DNS Only, what should I disable?

While waiting for the DNS Only version of Interworx to be released, I'm using just a normal install for my remote dns servers. I've disabled a few things like mail, etc...but was wondering if anyone has an extensive list of all the process that could be deactivated on an interworx server that is only being used as a remote synced dns server for the rest of the interworx cluster.

Thanks in advance!