Im stuck in validating the hybrid outbound connector in office 365, it always falied for the TLS part and i get that message which is related to the certificate
Couldnt validate the recipient's email server certificate. The certificate subject name doesn't match the domain you specified.
I already checked the subject name mail.domain.com and it's correct, also follow the below Microsoft article
but still the issue persist, and not sure where to check? so any help in that.