HPUX bind to NT DNS

[Clive.H. at lana.pathlink.com]

I am a newbie  with a single ethernet lan on which is a NT 4 server
and a HPUX 10.20 server.
I am trying to set up sendmail, so that I can mail to and fro between
servers and make life easier (Amen!).

I have no primary or secondary dns server enabled, using a caching
only setup in the hope that the NT will serve names on the HP's
behalf. This ain't happening, and I am concerned that if I cant
resolve the domain name lookup, there is no point attempting to setup
sendmail.

DNS seems ok on the NT server with the following

Name 			Record type 	Data
mydomain.com	SOA			dell01.mydomain.com,
admin.mydomain.com
mydomain.com	NS			dell01.mydomain.com
mydomain.com	WINS			121.123.212.130
hp01			A			121.123.212.131
dell01		A			121.123.212.130

nslookup fails like this....
-----------------------------------------------------------------------------
# nslookup dell01
*** Can't find server name for address 121.123.212.130: Non-existent
domain
*** Default servers are not available
Default NIS Server:  hp01
Address:  121.123.212.131

Trying NIS
Name:    dell01
Address:  121.123.212.130
-----------------------------------------------------------------------------

Finally resolves via NIS.

Can't get the domain name to respond either. I understand that it
should resolve this from etc/hosts

-----------------------------------------------------------------------------
# nslookup mydomain.com
*** Can't find server name for address 121.123.212.130: Non-existent
domain
*** Default servers are not available
Default NIS Server:  drmyhp01
Address:  121.123.212.131

Trying NIS

*** No address information is available for "mydomain"
-----------------------------------------------------------------------------

I have provided some output to assist.

-----------------------------------------------------------------------------
# ifconfig btlan01
btlan01: flags=863<UP,BROADCAST,NOTRAILERS,RUNNING,MULTICAST>
        inet 121.123.212.131 netmask ffffffc0 broadcast
121.123.212.191
-----------------------------------------------------------------------------
# netstat -rn
Routing tables
Destination     Gateway         Flags   Refs     Use  Interface  Pmtu
PmtuTime
127.0.0.1       127.0.0.1       UH         0   14630  lo0        4608
121.123.212.131 127.0.0.1       UH        32   99941  lo0        4608
default         212.240.155.129 UG         0     513  btlan01    1500
121.123.212.128 212.240.155.131 U         33 3102688  btlan01    1500
-----------------------------------------------------------------------------
#more etc/hosts 
121.123.212.130 mydomain.com dell01
121.123.212.129 gateway
121.123.212.131 hp01
127.0.0.1       localhost
-----------------------------------------------------------------------------
#more etc/resolv.conf
domain mydomain.com
nameserver 121.123.212.130     # dremy-uk01
-----------------------------------------------------------------------------

Have I got it wrong conceptually? Any clues or suggestions would be
greatly appreciated

Clive H.