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Event ID: 12016 Source: MSExchangeTransport

Level
Description
There is no valid SMTP Transport Layer Security (TLS) certificate for the FQDN of <domain>. 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 <domain> should be installed on this server as soon as possible. You can create a new certificate by using the New-ExchangeCertificate task.
Comments
 
As per Microsoft: "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". See MSEX2K3DB for details on fixing this problem.

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