exchange user getting certificate error

[santoshw1981]

exchange user getting certificate error for hostnane.domain.local but external user are not getting this error

[#2]

Getting this error in Outlook?
Can you check Get-ExchangeCertificate and check if any certificate is Expired. You should also have an alert in EAC if that's the case.

[#3]

Certificate not expired. it is working fine with external users those . It is not working for XYZ.local