Exchange server 2003 error # 5.7.1 smtp; 550 5.7.1

We have exchange server 2003 sp2. separated we have the DC on win2003 sp2.
One of our employees want to send and email to client but we receieved the following error:

From: System Administrator
Sent: Wednesday, May 27, 2009 11:37 AM
To: info@ceratravel.com; copy@ceratravel.com; edukacija@ceratravel.com
Subject: Undeliverable: FW: Request URGENT

Your message did not reach some or all of the intended recipients.

      Subject:      FW: Request URGENT
      Sent:      5/27/2009 11:37 AM

The following recipient(s) could not be reached:

      info@ceratravel.com on 5/27/2009 11:37 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <server.domain.com #5.7.1 smtp;550 5.7.1 <server.domain.com >: Helo command rejected: Host not found>

      copy@ceratravel.com on 5/27/2009 11:37 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <server.domain.com  #5.7.1 smtp;550 5.7.1 <server.domain.com >: Helo command rejected: Host not found>

      edukacija@ceratravel.com on 5/27/2009 11:37 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <server.domain.com  #5.7.1 smtp;550 5.7.1 <server.domain.com >: Helo command rejected: Host not found>

Please let us know what it is the problem.
FaustinoeltinoAsked:
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jawad1481Commented:
HI!
 
First of all could you let us know the domains between which you are trying send emails.


I think you Exchange server ( System Administrator) is Authoritative. And the users belong to the other domain.

Have your company trying to introduce new domain , like one company A taking over Company B ?

Thanks.

Jawad.
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shadowlesssCommented:
Do you have reverse DNS set up with your ISP?

Some mail systems will not accept mail without being able to perform a reverse DNS lookup to confirm you are a legitimate source
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DCMBSCommented:
Try the folowing:

Open Exchange System Manager. Navigate to Administrative Groups, Site, Servers, Servername, Protocols, SMTP, Default SMTP Virtual Server,

Highlight Default SMTP Virtual Server and right click properties.

Click on  the Delivery Tab, and then click Advanced Button.

In the "Fully-qualified domain name: field, enter your fully qualified external domain name.

Restart SMTP service.

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jawad1481Commented:
HI!

I think we don't have any allow permission on Exchange Domain Server Group.

Open Exchange System Manager --> expand administrative groups --> Servers --> select your server --> right click --> properties --> security --> Exchange Domain Servers --> Allowed the send as permission --> advanced tab --> Check on Advanced and check Allow inheritable permission from
the parent to propagate to this object and all child object.


Let me know.

Thanks.

Jawad.
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FaustinoeltinoAuthor Commented:
jawad1481: this is our email domain for the California office where the user is trying to send the email.
shadowlesss: the reverse dns is set up correctly wiht the ISP
DCMBS: "fully qualified domain name" it is done already.
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DCMBSCommented:
Can you check your metabase.xml file and confirm that the FQDN has been replicated here.
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shadowlesssCommented:
what is the email domain for the sending server?
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FaustinoeltinoAuthor Commented:
I did what you said. and after that it works. I did have the wrong "Fully-qualified domain name" on the properties of Default SMTP Virtual Server. and change it to the Primary MX=10 and it is ok to send email to this specific clients. Thanks  a lot.
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