5/20/2023 0 Comments Thunderbird and gmailWhile my question here is specifically about Thunderbird, I include this information as to me it suggests that something may recently have changed about Gmail which is causing problems for email clients in general, or that it is something in my system which is doing the same. If I try to send an email I get "Authentication failed: 35-5.7.8 Username and Password not accepted". Sylpheed: No error messages on opening or when I click "Get, but no inbox messages are downloaded. Evolution: when I open it, a Google account authentication request window appears with error messages: "OAuth2 secret not found", "Access blocked", "Error 400: invalid_request". I have tried to set up two other email clients, Evolution and Sylpheed, to connect to my Gmail account. Following the steps suggested by Toad-Hall on the Mozilla Support forum. Tweaking the configuration as suggested by SumDumGuy on the Gmail Help forum Checking for previously saved passwords (there were none). Completely uninstalling and reinstalling Thunderbird (again). OAuth2 is set as authentication method. Thunderbird is set to always accept cookies. I have no antivirus (Linux does not need one) or add-ons. I am 100% sure of my password and that it has been entered correctly. Am finding emails have disappeared from Tbird but still there in Gmail inbox. When I do this this error message appears: "Authentication failure when connecting to server ". Am new to thunderbird on Win10pro, using multiple Gmail account (incl G suite for work), would like to delete emails from gmail once deleted from Thunderbird 78.1.0 (32 bit). ![]() I enter my name and then password, after which I am prompted to allow Thunderbird access to my account. When I open Thunderbird or click "Get Messages" I am presented with the Google login window. ![]() After reinstalling Thunderbird (102.7.1 (64-bit)) on Mint 19.1 I have a persistent authentication error with my Gmail account, so I cannot send or receive my emails through Thunderbird.
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