I was looking in Event Viewer on our Exchange 2007 server. I noticed the following entries in the Application Log.
Event ID: 12014
Source: MSExchangeTransport
Description:
Microsoft Exchange could not find a certificate that contains the domain name ourserver.domain.local in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector From PureMessage with a FQDN parameter of ourserver.domain.local. If the connector’s FQDN is not specified, the computer’s FQDN is used. Verify the connector configuration and the installed certificates to make sure that there is a certificate with a domain name for that FQDN. If this certificate exists, run Enable-ExchangeCertificate -Services SMTP to make sure that the Microsoft Exchange Transport service has access to the certificate key.
Event ID: 12015
Source: MSExchangeTransport
Description:
An internal transport certificate expired. Thumbprint:CertificatThumbprint
I did some checking and found out that the self-signed certificate that is used to secure email communications had expired. So I had to renew the certificate. I used the steps on this site to accomplish the task. The only additional step I did was to restart the server.
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