Hi,
I am trying to install Zimbra on CentOS. I am using split dns but cant resolve errors.Below are my files. I am installing it for first time pls help . wat i dng wrong?? My domain is with godaddy.

This is my dig command

[root@mail ~]# dig mail.smackthank.com any

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-20.P1.el5 <<>> mail.smackthank.com any
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64441
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;mail.smackthank.com. IN ANY

;; ANSWER SECTION:
mail.smackthank.com. 3124 IN CNAME pop.secureserver.net.

;; AUTHORITY SECTION:
smackthank.com. 172322 IN NS ns42.domaincontrol.com.
smackthank.com. 172322 IN NS ns41.domaincontrol.com.

;; Query time: 4 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Apr 17 11:55:39 2012
;; MSG SIZE rcvd: 123

[root@mail ~]# dig mail.smackthank.com mx

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-20.P1.el5 <<>> mail.smackthank.com mx
;; global options: printcmd
;; connection timed out; no servers could be reached


Host File

# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 leosys.in leosys localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
172.16.0.21 mail.smackthank.com mail

Resolve.conf File

search smackthank.com
nameserver 127.0.0.1

Named file

options {
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
forwarders { 172.16.0.21 ; };
};
include "/etc/rndc.key";
// We are the master server for server.example.com
zone "server.smackthank.com" {
type master;
file "db.server.smackthank.com";
};

Zone File

; Addresses and other host information.
;
$TTL 6000
@ IN SOA server.smackthank.com. hostmaster.server.smackthank.com. (
10118 ; Serial
43200 ; Refresh
3600 ; Retry
3600000 ; Expire
2592000 ) ; Minimum
; Define the nameservers and the mail servers
IN NS 172.16.0.21
smackthank.com. IN MX 20 mail.smackthank.com.
mail.smackthank.com. IN A 172.16.0.21