Assign TLS certificate to Client Frontend receive connector

If we try to connect with SMTP (port 587), the client warn you about certificate issue: by default Exchange use selfsigned cert even if there is a valid cert (signed by a External authority).

If we check connector we'll find that TlsCertificateName is empty

So, we proceed to assign the certificate name to the Client Frontend connector:

Now the client send the email without any warning!

reference: https://practical365.com/exchange-server/configuring-the-tls-certificate-name-for-exchange-server-receive-connectors/