550 5.7.1 Unable to relay Exchange 2010

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    I have just installed a new exchange server 2010 on Windows 2008R2 server. i can send e-mails but I cannot received external e-mail from other domains. The error message I ‘m getting:
    Reporting-MTA: dns; karawin.naurugov.nr
    X-Postfix-Queue-ID: EB3FE7FC803
    X-Postfix-Sender: rfc822; [email protected]
    Arrival-Date: Thu, 21 Mar 2013 09:43:11 +1200 (NRT)

    Final-Recipient: rfc822; [email protected]
    Original-Recipient: rfc822;[email protected]
    Action: failed
    Status: 5.7.1
    Remote-MTA: dns; naurutest.gov.nr
    Diagnostic-Code: smtp; 550 5.7.1 Unable to relay”

    Kindly appreciate your assistance.


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