Hi all,

Exchange 2013_CU9 With multiple older/expired SMTP-enabled SAN certs installed, New wildcard cert was installed and SMTP-enabled before the old ones expired. When the old ones expired, I started to get

"There is no valid SMTP Transport Layer Security (TLS) certificate for the FQDN of Mail1.domain com The existing certificate for that FQDN has expired. The continued use of that FQDN will cause mail flow problems. A new certificate that contains the FQDN of MAIL1.domain.com should be installed on this server as soon as possible. You can create a new certificate by using the New-ExchangeCertificate task."

Why? Should I remove all the old ones With "Date invalid" to get rid of this? And how can I do this without something breaking here?

Thanks.

• Edited by RayHell 12 minutes ago