Hello,
When you install Microsoft Exchange Server , it creates a self-signed certificate with a validity period of 5 years. This certificate is assigned as the initial default SMTP certificate. This certificate is used for the mutual TLS connections between the Microsoft Exchange Servers within an Exchange Organization. This certificate is also presented to external mail systems when mutual TLS is required.
Normally, these certificates won't impact the normal working of SMTP functionality. But, if for any reason, if you need to un assign the SMTP service, please follow the steps
- Run Get-ExchangeCertificate and find the thumbprint of the interested certificates
- Run Disable-ExchangeCertificate –Thumbprint xxxxxx –Service SMTP Substitute the thumbprint from the first step
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Regards,
Manu