Just a nitpick, but FYI: Thunderbird now has an integrated PGP implementation, but it does not use GnuPG (GPG). Rather they integrated another PGP implementatio

Just a nitpick, but FYI: Thunderbird now has an integrated PGP implementation, but it does not use GnuPG (GPG). Rather they integrated another PGP implementation called RNP. The standard is called OpenPGP, PGP is the original (proprietary) implementation and GnuPG was originally created as a compatible free software alternative to PGP. In previous Thunderbird versions (before 78), the quasi-standard Enigmail extension provided OpenPGP support via GPG. A side effect of this is that Thunderbird does not interact with your GPG keyring anymore. So if you locally trusted a certain key using GPG for example, Thunderbird won't know about it and will ask you to verify it again. Sources: https://blog.thunderbird.net/2020/09/openpgp-in-thunderbird-78/ https://blog.thunderbird.net/2020/09/openpgp-in-thunderbird-... and https://wiki.mozilla.org/Thunderbird:OpenPGP:Migration-From-Enigmail https://wiki.mozilla.org/Thunderbird:OpenPGP:Migration-From-...