After shift mail server from old to new on opensuse 13.1 not receive any mail

Hi all,

I install ispconfig latest version on opensuse 13.1 everything is ok but when i shift my live server in new server not receive any mail. After send mail to this server from another server this show me

This is the mail system at host mail.quantummethod.org.bd.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<mohib@domain>: host domail[ip] said: 554 5.7.1
<mohib@domain>: Relay access denied (in reply to RCPT TO command)

Reporting-MTA: dns; mail.example.com
X-Postfix-Queue-ID: A53B2380A65
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Sun, 21 Dec 2014 16:44:47 +0600 (BDT)

Final-Recipient: rfc822; mohib@domain
Original-Recipient: rfc822;mohib@domain
Action: failed
Status: 5.7.1
Remote-MTA: dns; domain
Diagnostic-Code: smtp; 554 5.7.1 <mohib@domain>: Relay access denied

Please help me for solve this error.

Thanks