Hello,

Please see the attached error from Exchange 2019 Server, send smtp logs and connectivity logs...when I check the Dynu email sent log, no emails are received...As can be seen SMTP TLS actually connected and no issue, but wild card certificate maybe an issue.

Log Begin
2024-12-17T07:54:31.597Z,To Dynu,08DD1E6436B2DC27,2,10.0.10.10:14934,168.235.105.136:25,+,,
2024-12-17T07:54:31.826Z,To Dynu,08DD1E6436B2DC27,3,10.0.10.10:14934,168.235.105.136:25,<,220 relay.wiredblade.com ESMTP,
2024-12-17T07:54:31.827Z,To Dynu,08DD1E6436B2DC27,4,10.0.10.10:14934,168.235.105.136:25,>,EHLO email.desertclouds.com,
2024-12-17T07:54:32.043Z,To Dynu,08DD1E6436B2DC27,5,10.0.10.10:14934,168.235.105.136:25,<,250 relay.wiredblade.com SIZE STARTTLS AUTH LOGIN PLAIN HELP,
2024-12-17T07:54:32.043Z,To Dynu,08DD1E6436B2DC27,6,10.0.10.10:14934,168.235.105.136:25,>,STARTTLS,
2024-12-17T07:54:32.261Z,To Dynu,08DD1E6436B2DC27,7,10.0.10.10:14934,168.235.105.136:25,<,220 Ready to start TLS,
2024-12-17T07:54:32.262Z,To Dynu,08DD1E6436B2DC27,8,10.0.10.10:14934,168.235.105.136:25,*," CN=*.desertclouds.com CN=Go Daddy Secure Certificate Authority - G2, OU=http://certs.godaddy.com/repository/, O=""GoDaddy.com, Inc."", L=Scottsdale, S=Arizona, C=US 00DD41FA63408CCF20 17EFCDC8FFDEC381DA806CAF9FA2281FF36C7051 2024-01-04T22:47:19.000Z 2025-02-04T22:47:19.000Z *.desertclouds.com;desertclouds.com",Sending certificate Subject Issuer name Serial number Thumbprint Not before Not after Subject alternate names
Log end

Any advice would help,
Thx