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@freakazoid @emacsen @drwho Another barrier to GPG adoption was that mainstream email clients (Gmail, Outlook and, yes, even Thunderbird) have supported other useless encryption schemes like S/MIME. GPG plugins and extensions have been around for a long time, but each one came with interoperability or usability issues.

Finally Thunderbird has built-in GPG support (still very immature, and using its own key store rather than the system's).