I just installed Zimbra in ubuntu and is not working, I cant send emails inside nor outside.

I have been reading forums and papers about DNS and Split DNS, done a lot of changes and
can't get zimbra to work.

From outside this is what I get

The Postfix program

: connect to mx1.compania.org[]: Connection timed out

Reporting-MTA: dns; hosting.myhost.com
X-Postfix-Queue-ID: 343AB184BE7
X-Postfix-Sender: rfc822; xxxxxx@yahoo.com
Arrival-Date: Sat, 10 Sep 2011 15:33:25 -0700 (PDT)

Final-Recipient: rfc822; eddy@compania.org
Action: failed
Status: 4.0.0
Diagnostic-Code: X-Postfix; connect to mx1.compania.org[]:
Connection timed out


root@compania:~# dig compania.org

; <<>> DiG 9.7.0-P1 <<>> compania.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 24300
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;ccp.org.do. IN A

;; Query time: 0 msec
;; WHEN: Wed Sep 14 08:06:29 2011
;; MSG SIZE rcvd: 28

My internal IP is

hostname and hostname -f
return myserver.compania.org

Thanks in advance for your help.