@protonmail Do you know of any issues with the Bridge and Thunderbird 78? I keep getting "Unable to log in at server. Probably wrong configuration, user name, or password." On Thunderbird 68, from the Debian repositories, it works just fine, and other (non-Proton) e-mail accounts also work in 78.
@haru The Thunderbird team have confirmed that this is a bug on their side, and they are already actively working on a fix: https://bugzilla.mozilla.org/show_bug.cgi?id=1590473. Meanwhile, we suggest using the previous stable release v68.X or using plaintext authentication for SSL as a workaround. Note that the plain text authentication method should not be a degradation in user security, as it only impacts the local communication on your device between the email client and Bridge.
@protonmail Thanks for getting back to me. I'll try the plain text setting.
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