problem with resolving SOME EXTERNAL domains

[enesz at bih.net.ba]

Hi all,
 
I am new to this mailing list.
 
I administrate two name servers (master and slave).
Configuration is Solaris 9, Bind 9.2.3.
 
When I moved the Bind to new hardware platform (two SPARC machines)
problems started to hapen.
I just can not resolve some domais (mail admistrators says that this is
big amount of domains not resolving - mail communicate with DNS server
because of SPAMASSASIN).
DNS server from some other domain CAN resolve those domains
(www.dnsstuff.com <http://www.dnsstuff.com/>  also).
I am prety much sure that my Bind configuration is fine, i checked
nsswintch.conf file, DNS servers ARE NOT behind any firewall, i put
query-source address * port 53; directive in named.conf (in every case),
BUT NOTHING HELPS.
TCP and UDP seems works fine. I checked it through SNOOP and netstat -s.
 
Do you have some sugestions.
 
Thanks in advance.
 
P.S I used default installations of Solaris 9 form vendor (Fujitsu
Siemens). I thinking of new instalation of Solaris 9.