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:


Product Name


Product Version

14.0 (Exchange 2010)

Event ID


Event Source


Alert Type


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 sender address returned validation errors.


This Error event indicates a problem validating the e-mail address of a sender that was using "Send as" permission to send a message. The Active Directory directory service lookup for the address of the sender returned the specified validation errors.

The "Send as" permission allows recipients to send e-mail messages as if the message originated from a different recipient. Specifically, recipients who are granted the "Send as" permission to any mail-enabled object can enter the other recipient's name in the From field for the messages that they send.

For example, assume that Michelle has been granted "Send as" 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.

For more information, see: Manage Send As Permissions for a Mailbox.

User Action

To resolve this error, 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 recipient has the "Send as" permission granted to the specified mail-enabled object.

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.