MSExchange Antispam 101

  • Article

 

This article provides an explanation and possible resolutions for a specific Exchange event. If you don't find what you’re looking for here, try searching Exchange 2010 Help.

Details

Product Name

Exchange

Product Version

14.0

Event ID

101

Event Source

MSExchange Antispam

Category

General

Symbolic Name

DnsNotConfigured

Message Text

Protocol Analysis: DNS is not configured. Most likely, no DNS servers found. Sender Reputation calculations are disabled.

Explanation

This Error event indicates that the server cannot access a Domain Name System (DNS). Both sender reputation calculation and the ability to add items to the block list require that name resolution be configured and functional.

For information about sender reputation, see:

User Action

To resolve this problem, follow one or more of these steps:

  • Review the Application log and System log on your Exchange 2010 servers for related events. For example, events that occur immediately before and after this event may provide more information about the root cause of this error.

  • Make sure that the DNS configuration is accurate:

    1. Use the command prompt command ipconfig /all to verify that the DNS information is correct.

    2. If needed, refresh the DNS cache on the server. Enter ipconfig /flushdns and then ipconfig /registerdns at a command prompt to clear the DNS cache and refresh the DNS lease and reregister the DNS name.

    3. Verify the DNS information is correct by entering ipconfig /all at a command prompt.

  • Make sure that the server that runs Exchange Server 2010 can ping the DNS server.

  • Resolve your issue by using self-support options, assisted support options, and other resources. You can access these resources from the Exchange Server Solutions Center. From this page, click Self-Support Options in the navigation pane to use self-help options. Self-help options include searching the Microsoft Knowledge Base, posting a question at the Exchange Server forums, and other methods. Alternatively, in the navigation pane, you can click Assisted Support Options to contact a Microsoft support professional. Because your organization may have a specific procedure for directly contacting Microsoft Product Support Services, be sure to review your organization's guidelines first.

For More Information

If you are not already doing so, consider running the Exchange tools, which have been 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 and improve mail flow. 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.