Thunderbird will not set up the Existing Email address. .After "the following settings were found by probing the given server", ....... unable to log in at server, ... etc the settings are certainly good because they work on macOS Mojave


It's looks like a server side problem: Thunderbird 78 can't connect to Courier Mail Server anymore because Courier can't handle TLS1.2.

Releted topic: https://superuser.com/questions/1600014/thunderbird-78-doesnt-want-to-connect-to-my-courier-server-imap-how-do-i-mak

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