This list of trusted certificates provided and maintained by Google applies only to Gmail for S/MIME. The list of CAs are trusted solely at Google's discretion and Google retains the right to remove root CAs at will, with or without reason.
Important: At least one intermediate CA certificate must be present in the chain. That is, the root must not issue end-entity certificates directly.
CA certificates trusted by Gmail for S/MIME
Actalis
Amazon
Atos
Beijing Certificate Authority
CA Disig a.s.
certSIGN
Chunghwa Telecom Corporation
Comodo
D-TRUST
Deutsche Telekom Security GmbH
Dhimyotis
Dhimyotis / Certigna
DigiCert
DigitalSign Certificadora Digital
e-commerce monitoring GmbH
eMudhra Inc
eMudhra Technologies Limited
Entrust
GlobalSign
GoDaddy
Google Trust Services (GTS)
Government of Spain, Autoritat de Certificació de la Comunitat Valenciana (ACCV)
Government of The Netherlands, PKIoverheid (Logius)
HARICA
IdenTrust
Krajowa Izba Rozliczeniowa S.A. (KIR)
LAWTrust
Microsec e-Szignó CA
NetLock Ltd.
QuoVadis
SECOM Trust Systems Co. Ltd.
Sectigo Limited
SSL Corporation
SwissSign AG
T-Systems International GmbH (Deutsche Telekom)
Taiwan-CA Inc. (TWCA)
Telia Company (formerly TeliaSonera)
TrustAsia Technologies, Inc.
Trustwave
UniTrust
WISeKey
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Actualizado en febrero de 2020