[cobalt-users] sendmail

All mail on my Raq2 is queued but never sent. It seems like it might be a hostname lookup problem but all pings/nslookup's work fine. Should I be updating bind or sendmail? or both? Here is (some of) the mailq -

e5O1u3P10209     1929 Sat Jun 24 12:05 MAILER-DAEMON
                 (Deferred: Name server: mail.dragnet.com.au.: host name looku)
                                       scottwb@xxxxxxxxxxxxxxxxxxx
e5O102P09795      172 Sat Jun 24 11:00 root
                 (Deferred: Name server: mail.dragnet.com.au.: host name looku)
                                       scottwb@xxxxxxxxxxxxxxxxxxx
e5O1S2M10017      596 Sat Jun 24 11:28 nobody
                 (Deferred: Name server: virtual2.dragnet.com.au.: host name l)
                                       scottwb@xxxxxxxxxxxxxx