Microsoft Exchange could not find a certificate that contains the domain name in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector Outbound Ex 2010 with a FQDN parameter of 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.


Problem is that you have configured a wrong (not matching)  SSL certificate on your send/recieve connector.


  • Start the Exchange Powershell
  • Get-ExchangeCertificate
  • Copy the good thumbprint
  • Enable-ExchangeCertificate -Services SMTP
  • Paste the good thumbprint

More information:

Author: Thomas Faddegon

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