Postfix unable to send email for specific domain

[kshitij mali]

we are unable to send email for domain lcit.com

we get following error in the email logs:

Feb 20 00:54:17 D1OKH680RL postfix/smtp[4993]: 390077605C3: to=<
xxxxxx at lcit.com <teerapat at MitsubishiElevatorAsia.co.th>>, relay=none,
delay=13164, delays=13144/0/20/0, dsn=4.4.3, status=deferred (Host or
domain name not found. Name service error for name=lcit.com type=MX: Host
not found, try again)



please find the below dig and dig with trace result below:

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

[root at D1OKH680RL ~]# dig  lcit.com  mx



; <<>> DiG 9.2.4 <<>> lcit.com mx

;; global options:  printcmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6691 ;; flags: qr rd
ra; QUERY: 1, ANSWER: 5, AUTHORITY: 2, ADDITIONAL: 5



;; QUESTION SECTION:

;lcit.com.                      IN      MX



;; ANSWER SECTION:

lcit.com.               34176   IN      MX      10 mail.lcit.com.

lcit.com.               34176   IN      MX      20 backmail.lcit.com.

lcit.com.               34176   IN      MX      12816 mx1.samart.co.th.

lcit.com.               34176   IN      MX      20000 mx4.samart.co.th.

lcit.com.               34176   IN      MX      5 mx1.lcit.com.



;; AUTHORITY SECTION:

lcit.com.               33947   IN      NS      tee.samart.co.th.

lcit.com.               33947   IN      NS      jiab.samart.co.th.



;; ADDITIONAL SECTION:

mx1.lcit.com.           33947   IN      A       203.149.3.68

mail.lcit.com.          34176   IN      A       203.149.3.71

backmail.lcit.com.      34176   IN      A       58.137.81.18

tee.samart.co.th.       860     IN      A       203.149.0.3

jiab.samart.co.th.      858     IN      A       203.149.0.2



;; Query time: 0 msec

;; SERVER: 155.14.30.133#53(155.14.30.133) ;; WHEN: Tue Feb 21 20:39:55
2012 ;; MSG SIZE  rcvd: 261

 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

[root at D1OKH680RL ~]# dig +trace lcit.com  mx



; <<>> DiG 9.2.4 <<>> +trace lcit.com mx ;; global options:  printcmd

                       438530  IN      NS      j.root-servers.net.

                       438530  IN      NS      k.root-servers.net.

                       438530  IN      NS      l.root-servers.net.

                       438530  IN      NS      m.root-servers.net.

                       438530  IN      NS      a.root-servers.net.

                       438530  IN      NS      b.root-servers.net.

                       438530  IN      NS      c.root-servers.net.

                       438530  IN      NS      d.root-servers.net.

                       438530  IN      NS      e.root-servers.net.

                       438530  IN      NS      f.root-servers.net.

                       438530  IN      NS      g.root-servers.net.

                       438530  IN      NS      h.root-servers.net.

                       438530  IN      NS      i.root-servers.net.

;; Received 316 bytes from 127.0.0.1#53(127.0.0.1) in 1 ms



com.                    172800  IN      NS      m.gtld-servers.net.

com.                    172800  IN      NS      a.gtld-servers.net.

com.                    172800  IN      NS      b.gtld-servers.net.

com.                    172800  IN      NS      k.gtld-servers.net.

com.                    172800  IN      NS      d.gtld-servers.net.

com.                    172800  IN      NS      c.gtld-servers.net.

com.                    172800  IN      NS      e.gtld-servers.net.

com.                    172800  IN      NS      i.gtld-servers.net.

com.                    172800  IN      NS      h.gtld-servers.net.

com.                    172800  IN      NS      j.gtld-servers.net.

com.                    172800  IN      NS      f.gtld-servers.net.

com.                    172800  IN      NS      g.gtld-servers.net.

com.                    172800  IN      NS      l.gtld-servers.net.

;; Received 498 bytes from 192.58.128.30#53(j.root-servers.net) in 2 ms



lcit.com.               172800  IN      NS      jiab.samart.co.th.

lcit.com.               172800  IN      NS      tee.samart.co.th.

;; Received 75 bytes from 192.55.83.30#53(m.gtld-servers.net) in 268 ms



;; connection timed out; no servers could be reached
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Regards,
Kshitij
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