See for a thread explaining why you can't use their SSL/TLS certificates for S/MIME.įirefox and Microsoft Internet Explorer contain cryptotools capable of generating public/private keypairs. Let's Encrypt does not currently offer S/MIME certificates. It can also cost money to revoke a free certificate. Everybody else appears to offer a free certificate for personal use for only 30 days, or require you to buy one. Wosign (WoSign certificates have been revoked by Mozilla)Ĭurrently only Actalis seems to offer a free S/MIME certificate for personal use that is good for one year.StartCom (StartCom certificates have been revoked by Mozilla).Secorio (Affiliated Partner of Sectigo (formerly called Comodo) that links to InstantSSL if you want a free certificate).InstantSSL (free certificate is now a 30 day trial).GlobalSign (No longer offer free certificates).Comodo (They've changed their name to Sectigo and no longer offer free S/MIME certificates/).CAcert (CAcert is NOT one of the trusted authorities built-in to FireFox and ThunderBird. ![]() Certificate Authorities Sources of Free S/MIME Certificatesįree certificates usable for S/MIME are available from:
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