External email not received with NDR '550 5.4.317 Message expired, cannot connect to remote server(C
Hi all, we are getting some problem from one of the external domain not getting through. there is a NDR to the sender '550 5.4.317 Message expired, cannot connect to remote server(CertificateExpired)' I also run some test using checktls and it also report [001.696] Connection converted to SSL SSLVersion in use: TLSv1_3 Cipher in use: TLS_AES_256_GCM_SHA384 Perfect Forward Secrecy: yes Session Algorithm in use: Curve P-256 DHE(256 bits) Certificate #1 of 3 (sent by MX): EXPIRED Cert VALIDATION ERROR(S): certificate has expired So email is encrypted but the recipient domain is not verified ssl : scheme=smtp cert=94220930177 : identity=mail.domain.com cn=*.domain.com alt=2 *.domain2 domain.com Cert Hostname VERIFIED (mail.domain.com = *.domain.com | DNS:*.domain.com | DNS:domain.com) cert not revoked by OCSP Data: Version: 3 (0x2) Serial Number: 0e:cd:b7:0b:82:c2:46:0b::5c:0b:b4:29:5f:e2 Validity: Not Before: Oct 26 00:00:00 2021 GMT Not After: Nov 26 23:59:59 2022 GMT I have check all exchange server and mail security gateway, all using new ssl certificate. can anyone shed some light on this matter. Thank you all
