There is no valid SMTP Transport Layer Security (TLS) certificate for the FQDN of %1. The existing certificate for that FQDN has expired. The continued use of that FQDN will cause mail flow problems. A new certificate that contains the FQDN of %1 should be installed on this server as soon as possible. You can create a new certificate by using the New-ExchangeCertificate task.

Details
Product: Exchange
Event ID: 12016
Source: MSExchangeTransport
Version: 8.0
Symbolic Name: STARTTLSCertificateExpired
Message: There is no valid SMTP Transport Layer Security (TLS) certificate for the FQDN of %1. The existing certificate for that FQDN has expired. The continued use of that FQDN will cause mail flow problems. A new certificate that contains the FQDN of %1 should be installed on this server as soon as possible. You can create a new certificate by using the New-ExchangeCertificate task.
   
Explanation

This Error event indicates that the certificate that was used for Transport Layer Security (TLS) for a specific connector on this computer has expired. The connector name is returned with the Error event.

   
User Action

To resolve this error, you must use the New-ExchangeCertificate cmdlet to create a new TLS certificate for the fully qualified domain name (FQDN) for the connector on the computer that returned this Error event. For more information, see Creating a Certificate or Certificate Request for TLS.

If you are not already doing so, consider running the tools that Microsoft Exchange offers to help administrators analyze and troubleshoot their Exchange environment. These tools can help you make sure that your configuration is in line with Microsoft best practices. They can also help you identify and resolve performance issues, improve mail flow, and better manage disaster recovery scenarios. Go to the Toolbox node of the Exchange Management Console to run these tools now. For more information about these tools, see Toolbox in the Exchange Server 2007 Help.

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