You need information on the Certificate Authorities (CA) that are trusted by the Symantec Email Security.cloud service when enforcing TLS using Strong certificate validation.
A CA is a trusted third-party organization or company that issues digital certificates. These certificates are used to create digital signatures and public-private key pairs.
The role of the CA is to guarantee that the company or individual granted the unique certificate is, in fact, who they claim to be. CAs are a critical component in data security as they guarantee the identity of the two parties exchanging information.
Example:
Organization
AC Camerfirma S.A.
Actalis S.p.A.
AffirmTrust
Amazon
Atos
A-Trust Ges. f. Sicherheitssysteme im elektr. Datenverkehr GmbH
Baltimore
certSIGN
CESCA Root Certification Authority
Chunghwa Telecom Co., Ltd.
COMODO CA Limited
Comodo CA Limited
Cybertrust, Inc
Dhimyotis
DigiCert Inc
Digital Signature Trust Co.
D-Trust GmbH
Entrust, Inc.
GeoTrust Inc.
GlobalSign
GlobalSign nv-sa
GoDaddy.com, Inc.
Hongkong Post
IdenTrust
IPS Certification Authority s.l. ipsCA
NetLock Halozatbiztonsagi Kft.
NetLock Kft.
Network Solutions L.L.C.
QuoVadis Limited
SECOM Trust Systems CO.,LTD.
SECOM Trust.net
Sectigo
SecureTrust Corporation
Staat der Nederlanden
Starfield Technologies, Inc.
StartCom Ltd.
SwissSign AG
Symantec Corporation
TAIWAN-CA
TC TrustCenter GmbH
TDC
TeliaSonera
thawte, Inc.
The Go Daddy Group, Inc.
The USERTRUST Network
TRUST2408
Trustis Limited
T-Systems Enterprise Services GmbH
T-Systems International GmbH
Unizeto Sp. z o.o.
Unizeto Technologies S.A.
VeriSign, Inc.
Vodafone
If a particular CA/CN pair that is required for the successful email exchange via TLS enforcement is missing. Please let our support team know via a support case.