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We are running a caching name server on the server, chroot'ed to /var/lib/named, running as user "bind", and bound to the loopback interface only. This was installed via:
# apt-get install bind9 dnsutils bind9-doc
Edit /etc/default/bind9:
OPTIONS="-u bind -t /var/lib/named"
This shouldn't require any further configuration, as we only need caching DNS to support the mail server. If it does, named options are set in /etc/default/bind9.
Unfortunately, I had previously run "apt-get install bind", not realizing that the default was Bind8. I think I've removed all traces of Bind8 - "apt-get remove bind" didn't take everything with it, such as the startup script.