DNS reverse zone problem?

I have problems with reverse zone. I have classless adress from 0-63, so 
I'm wiht mask /26.
My reverse zone file:
$TTL 3600
$ORIGIN 0/26.XXX.XXX.XXX.in-addr.arpa.
_at_ IN SOA ns1.example.com. root.example.com. (
                        2005011901      ; Serial
                        10800           ; Refresh
                        3600            ; Retry
                        604800          ; Expire
                        3600 )          ; Minimum

_at_       IN NS   ns1.exapmle.com.


1     IN PTR  ns1.example.com.
7     IN PTR  mail1.example.com.
5     IN PTR example.com.

Error messages:

named[96142]: client SOURCE_IP#4981: query (cache) 
'MY_DNS_IP_ADDRESS.in-addr.arpa/PTR/IN' denied

it is a little bit strange because the dns server is with internal ip 
address 10.0.0.1, and the firewall in front it is making NAT for the 
extarnal IP address (XXX.XXX.XXX.1).
i haven't zone for network 10.0.0.0.
and the hosts file is:
127.0.0.1       localhost
 10.0.0.1       ns1.example.com
Any comment is appreciated.

nikolay nenchev