Cannot resolve a specific domain

[David E. Meier]

Hi list,

I got a complaint from a client of mine not being able to mail to a
certain domain (apexshipping.com.tw). Otherwise I am not aware of any
resolving problems of my DNS.

First thing, I downloaded the current named.root file and restarted named.
Then I ran:

$ dig apexshipping.com.tw +trace

; <<>> DiG 9.3.4-P1 <<>> apexshipping.com.tw +trace
;; global options:  printcmd
:
;; Received 488 bytes from 193.17.199.10#53(193.17.199.10) in 5 ms
:
;; Received 423 bytes from 192.203.230.10#53(E.ROOT-SERVERS.NET) in 161 ms
:
;; Received 356 bytes from 61.220.48.1#53(C.DNS.tw) in 291 ms

apexshipping.com.tw.    86400   IN      NS      dns.apexshipping.com.tw.
apexshipping.com.tw.    86400   IN      NS      dns1.apexshipping.com.tw.
;; Received 106 bytes from 220.229.225.196#53(f.twnic.net.tw) in 318 ms

dig: couldn't get address for 'dns.apexshipping.com.tw': not found

My DNS runs on FreeBSD 6.2-STABLE and the current version of bind is:
$ named -v
> BIND 9.3.4-P1

The server is used exclusively as DNS. I know the domain exists and is
resolvable through other DNS. I wonder if I could track down the problem
in any other way. Or would upgrading bind solve the problem?

Thanks for input. David.