Article ID: 974450 - Last Review: January 22, 2010 - Revision: 1.0 A new accepted domain that is added does not work in an Exchange Server 2007 organization
SYMPTOMSYou add a new domain to the accepted domain list in a Microsoft Exchange Server 2007 organization. When you send an e-mail message to this new accepted domain, you may receive the following NDR message: 550 5.7.1 Unable to relay for user@domain.com Additionally, the following event is logged in the Application event log:
CAUSEThis problem occurs because the accepted domain list is not updated after you add the new domain. After you add the domain, the Active Directory directory service sends a notification to the Exchange Transport component to update the accepted domain list. Sometimes, this notification is delayed and this notification times out. Therefore the accepted domain list is never updated. Additionally, laternotifications are not processed. RESOLUTIONTo resolve this problem, install the following update rollup: 972076
(http://support.microsoft.com/kb/972076/
)
Description of Update Rollup 2 for Exchange Server 2007 Service Pack 2
STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. MORE INFORMATIONFor more information about the accepted domain list, visit the following Microsoft Web site: http://technet.microsoft.com/en-us/library/bb124423(EXCHG.80).aspx
(http://technet.microsoft.com/en-us/library/bb124423(EXCHG.80).aspx)
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