In transition from Excahnge 2003 to Exchange 2010 I have difficulty to send any email to a user email account on 2010 server with this error:5.7.1 smtp;550 5.7.1 Unable to relay for auser@abcd.org

I completed installing an Exchange 2010 server in an Exchange 2003 environment. I was using one Excahnge 2003 for the company emails. Let's assume my company domain is called abcd.org. After completion of the 2010 server, I moved one user (Let's assume his account is auser@abcd.org). This user can send emails to any internal and external recipients successfuly, but any emaik from inside or outside of the company will not get to his Inbox. Here is the error:
You do not have permission to send to this recipient. For assistance, contact your system administrator.
  <jklm2.abcd.org #5.7.1 smtp;550 5.7.1 Unable to relay for fauser@abcd.org>

JKLM2 is the name of the 2003 server. The 2010 server is named MNOP2.
Please help me to resolve this problem ASAP.
Thank you all in advance

Jay
Jay555IT DirectorAsked:
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Jay555Connect With a Mentor IT DirectorAuthor Commented:
In fact I needed to change the Private IP in the spam controller appliance to point to the new Exchange 2010 server.
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Viral RathodConsultantCommented:
I guess you have not yet allow relay on Receive connector on Exchange 2010

Please refer this article by Akhater

http://www.zerohoursleep.com/2010/02/allow-relaying-on-exchange-2007-exchange-2010-in-4-easy-steps/
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Viral RathodConsultantCommented:
Basically we need to adjust the properties of the Default Receive Connector to allow anonymous access.

http://msexchangeteam.com/archive/2006/11/17/431555.aspx

Since enabling anonymous relaying on the default receive connector is a huge security issue ,i have suggest you to create separate receive connector

Here is an article wrote by Akhater that will guide you through it step by step
http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2666-Allow-relaying-on-Exchange-2007-Exchange-2010-in-4-easy-steps.html 
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getzjdCommented:
Exchange 2010 should have prompted you to create the legacy connector to the 2003 server in the setup.  Did you specify the 2003 during setup?
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Jay555IT DirectorAuthor Commented:
Answer to qetzid:

Yes, I did and I am able to send email from the one user account on the any internal and external recipients. Right now the mailbox database is on the 2003 server except the one I mentioned above.
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Viral RathodConsultantCommented:
The error message you have posted above is what you usually get when you try and send an email with another address in the from field that is different to your primary account AND you don't have permissions to do that.

Can you just right click on the user and check the E-mail Address ?

Can you please cross check the Receive connector settings & Make sure the domain name is listed under "Accepted Domains"
http://www.petri.co.il/configure-exchange-2007-recieve-email-other-domains.htm
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Viral RathodConsultantCommented:
By default anonymous users do not have the rights to submit email for external domains so we need to grant them, and this has to be done through the Exchange Management Shell. Enter the following command:

Get-ReceiveConnector "connector name" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "ms-Exch-SMTP-Accept-Any-Recipient"

Make sure you enter the connector name as it appears in the Management Console and run the command, it should confirm the permission has been added. As before make sure you restart the Transport Service and then test your new connector, and don't forget the open relay test to be sure!

http://www.petri.co.il/configuring-exchange-2007-send-connectors.htm
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Jay555IT DirectorAuthor Commented:
I do not find any place in Exch 2010 in Exchange Management Console to check the Recieve Connector.
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Jay555IT DirectorAuthor Commented:
This link http://www.petri.co.il/configuring-exchange-2007-send-connectors.htm 
Is all about sending an email. I don't have any problem sending an email out successfuly. IMy problem is RECIEING the emails sent from other persons from inside and outside of the Exchane.
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Jay555IT DirectorAuthor Commented:
I followed the instructions the 2 specialist shared with me, with no success. I posted help requests 2 more times and waited several days. Nobody responded to my questions, at the same time I continued working to resolve my problem and found out if I direct the emails to the new server, then emails will move in both directions without Error.
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