You have a hybrid deployment between a Microsoft Exchange Online tenant and an on-premises Exchange Server 2019 organization. The deployment contains an Exchange Server 2019 server named Server1.
Server1 has a public certificate named Cert1 that is bound to the SMTP protocol. Cert1 will expire soon.
you replace Cert1 with a new certificate named Cert2 from a different public certification authority (CA)
After you replace the certificate, you discover that email delivery between Server1 and the Exchange Online tenant fails.
You need to ensure that messages can be delivered successfully
What should you do on Server1?
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