530 Relaying not allowed - sender domain not local (530) Exchanger Server

This report is generated by the email server at:

       VBLCHODCSVR01.vattanacbank.local

The message with subject:

       "TESTING"

was not delivered to the following recipients:

Address: ra.sovanna@gmail.com

Reason:  530 Relaying not allowed - sender domain not local (530)

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Address: ricky_nara@yahoo.com

Reason:  530 Relaying not allowed - sender domain not local (530)

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E-mail Not deliver, Cos of ISP Relay, or ISP Relay Authenthication

Security Alert - information you exchange with this site (Exchange 2010)

Pimiento

nickaustin2

We edited the group policy on users machines to delete the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates key which has resolved the problem.
Delete the following registry key manually:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates

To do this, follow these steps:

1. Start Registry Editor
2. Locate the following registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot
3. Right-click and then delete the key that is called "Certificates"
4. Open Outlook - problem sorted!