Topic Last Modified: 2010-07-06

The Microsoft Exchange Server 2010 Management Pack for System Center Operations Manager monitors the Windows Application log on computers running Exchange 2010 and generates this alert when the events specified in the following Details table are logged.

To learn more about this alert, in Operations Manager, do one or more of the following:

From the Operations Console, double-click this alert, and then click the General tab. Review the description of the alert that includes the variables specific to your environment.
From the Operations Console, double-click this alert, and then click the Alert Context tab. Review the logged events that meet the criteria of this Operations Manager alert.

Details

Product Name	Exchange
Product Version	14.0 (Exchange 2010)
Event ID	1028
Event Source	MSExchangeTransport
Alert Type	Warning
Rule Path	Microsoft Exchange Server/Exchange 2010/Common Components/Hub Transport and Edge Transport/Transport
Rule Name	SMTP rejected a mail because the Active Directory lookup for the FROM address failed: the send-on-behalf-of check returned invalid data.

Explanation

This Error event indicates that the e-mail address of a sender that was using "Send on behalf" permission to send a message could not be validated. The Active Directory directory service lookup for the address of the sender returned the specified validation errors.

The "Send on behalf" permission allows recipients to send e-mail messages on behalf of another mail-enabled object. Specifically, recipients who are granted this permission can enter the name of other recipient in the From field for the messages that they send.

For example, assume that Michelle has been granted "Send on behalf" permissions for the mailbox of her manager, Laura. Michelle sends a message to Julia that has Laura's name in the From field. When Julia receives the message, the message appears to be sent by Laura. When Julia opens the message, the From field in the message shows that Michelle sent the message on behalf of Laura.

User Action

To resolve this problem, do one or more of the following:

Make sure that the Exchange server that logged this event can communicate with one or more Active Directory servers that are available in the organization.
Verify that the specified user has the "Send on behalf" permission granted to the specified sender.

For More Information

If you are not already doing so, consider running the Exchange tools created to help you analyze and troubleshoot your Exchange environment. These tools can help make sure that your configuration aligns with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. To run these tools, go to the Toolbox node of the Exchange Management Console. To learn more about these tools, see Managing Tools in the Toolbox.