I could not find any options in the web interface of Gmail.
All I could find was a Firefox plugin to use S/MIME with Gmail, but it seems to be outdated.
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related: www.mailvelope.com you can use PGP in ANY web-application with that plugin – rubo77 Jan 20 '15 at 20:01
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As per blog.google/products/g-suite/advanced-controls-for-gsuite, this should now be possible. – Michael Feb 1 '17 at 7:48
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There is Penango - https://www.penango.com/products - which seems to have a free edition for GMail. I looked into it a while back, since as you say, there isn't anything all that up-to-date, but haven't tried it (ended up going with S/MIME in Outlook checking my GMail account).
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thanks, that works. Be sure, you use the old standard-compose-message function and you import the root PEM certificate into firefox, if you use cacert at cacert.org/index.php?id=3 – rubo77 Feb 12 '13 at 12:27
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1Now it's only the question, how to read those mails on my android phone too? I guess with k9 mail or so... – rubo77 Feb 12 '13 at 13:24
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Use R2Mail2 on Android to read, decrypt, verify, sign and encrypt emails of both PGP, PGP/MIME and S/MIME formats. You can use the IMAP+SMTP interface to Gmail.
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Another option is Fossa Guard - S/MIME extension for Google Chrome browser. S/MIME certificates are free. And it is interoperable with many other mail clients.
