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As so many have experienced, but I have yet to find the actual solution, I will bring up the issue.

I recently purchased a new computer. Installed Thunderbird, created all the mail accounts I have and... no problems. All the accounts, once created, populated with emails. For 3-4 days, there were no issues.

Important to note: I let TB use all the default settings. And once everything was up and running >>>>I did not change anything<<<<<.

Then a few days later, I started getting the following messages for two accounts that had migrated from q.com to myctl.net. Entering the 100% proven-correct password results in the know endless-loop of entering the password and the same pop-up error message. The PW is 100% correct as I can go to Centurylinks' website and login using that same, exact password and read my emails.

I've spent enough time trying all the suggestions here, reddit, facebook etc so I'd thought I'd see if anyone has actually found a solution.

I have the latest Thunderbird update. Since yesterday, using imap.comcast.net, I have been getting the error "Login to server imap.comcast.net with username [removed] failed." It wants me to retry or enter a new password. I cannot get emails. I can, however, log into my Comcast email account online and see emails delivered. Thunderbird, of course, will not receive these emails.

For imap.comcast.net, port is 993, connection security is SSL/TLS, and authentication method is normal password. I have not changed any of these settings. I have not changed my password. I have done nothing to cause the problem.

I cannot find a solution online. Could someone help? Thank you!

I set up a new account last week and need instructions on how to navigate and use this forum. I cannot find the question I posted. I got no email saying it was answered. I also need information about these codes I keep getting in my inbox after I've already logged in. I don't know what to do with them. I'm a newbie and need an instruction pdf if there is one. Thanks.

tazlady1966@gmail.com that is the correct mail for my Google account but when I press the next button my Gmail changes to tazlady1966@gnail.com why does this keep doing this???

  Is my Gmail hacked or has a bug!!!

I have installed Thunderbird on my Samsung phone and synced it with the desktop. All three of my gmail accounts came up okay, but when I go into them I do not get the inbox, only outbox. When I click on each account to try to sign in I get an error that says "OAuth 2.0 is currently not supported with the provider". How can I sign in to my gmail accounts on my phone in Thunderbird?1

I changed my email password on the providers web site, my phone, tablet both asked for the new password but Thunderbird has not, why can I still send and receive email ?

And don't see a place to change the server password either, I thought it would just ask.

I am trying to add one of my Google email accounts to Thunderbird. It brings up the "Sign in with Google" window, which is normal. But instead of "Sign in to continue to Google...", it says "Sign in to continue to Mozilla Thunderbird Email". Which then generates an error: "Error 400. The server cannot process the request because it is malformed. It should not be retried. That’s all we know." I've not ever experienced this issue before; adding a Google account has always been super easy and straightforward.

My internet provider has required a new account password for my wife’s Thunderbird account. We have changed the account with the provider, but I cannot figure out how to change it in Thunderbird so she can logon and send email without having to re-enter the password each time. Several online searches have provided various “solutions” that lead to non-existent menu choices.

This shouldn’t be this hard! Is there a way to address this with a phone call to a knowledgeable real human being??

Using Thunderbird b150, but have tried -esr and regular TB. New install of Win11 26200.8037. Up to date Firefox. Have been trying for a week for Thunderbird to authenticate my Outlook account. Worked with Copilot. Finally found a TB setting, network.proxy.allow_hijacking_localhost, that was set to FALSE. Set it to TRUE and Outlook account authenticated. Able to finally send mail. This was last night. This morning: Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) smtp.office365.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. No changed to any programs. Have deleted Outlook saved password. Thunderbird NEVER offers to get password/authenticate. I am truly and sincerely frustrated.

If someone can help me, would sincerely appreciate.

I've been trying to get Thunderbird and the home manager of Nixos to work nicely together. This seems to have been the case judging by the vast amount of config options that are present in the tool.

However, it seems development slowed and I was wondering whether there's a workaround to some of the problems. More precisely, nixos only does static configs - so things you know at compile time. This works great for credentials you know a priori like plain passwords or probably also encrypted password but it starts to fail once tokens start getting involved like with oauth2 (any most likely also Kerberos).

Since home manager in nix does not know the the token, it can only populate the account half way. The rest is subsequently handled by Thunderbird itself, asking you to perform the OAuth flow.

Here are two distinct issues. 1. If I create the "wrong" account - plain password instead of oauth2 - and I update the account to oauth2. Even with a restart of the entire system, Thunderbird doesn't understand that it needs to perform the authentication flow again. Even if I delete any passwords Thunderbird has stored in it's password manager. 2. I have a bunch of email accounts, work, private, university. I would like to keep them separate [...]. However, suppose I have three mail boxes within my university domain and I added all of them in this incomplete fashion as I outlined (everything done except password / authentication), Thunderbird will perform the OAuth2 flow for the first mailbox but the it won't do it for the other two. I just get

The current operation on 'Inbox' did not succeed. The mail server for account ethz-main responded: Command Error. 12.

for the other two mail boxes.

I'm well aware that a big contributor to this issue is NixOS and Home Manager. And I'm in touch with these parties trying to find a solution. What I wanted to ask from the Thunderbird / Mozilla community:

Is there a way to reinitialize the OAuth2 flow or password prompts for any account from the UI or alternatively from the shell? Because deleting the credentials didn't start it (well at least in my case) and I would like to find an explicit way to tell Thunderbird "for account x, please ignore all authentication info you have, perform the auth flow again and then update the auth details with whatever response you got." I'd prefer to be able to things like this rather than deleting and adding the account again. Especially considering that across all Accounts I have about 30Gb of data needs to be fetched every time.

Thank you for your Response and Support

AS2k

Hi, help please I need to connect my mozilla account to antoher device and I tried everything to add it but it keeps asking for this WANTED verification code and I never get it, even if my mail is correct, I adeed the mozilla address mail. Of course there is no way to contact them as they rely on their community to do the work for them. I wanted to leave mozilla recently cause of the AI direction, and I see that the basic settings user's options don't even work correctly :*

thanks

My K-9 in Android suddenly stopped to work a couple of days ago. The server asks for autentification. I haven't changed anything. I've uninstalled and reistalled the app and restarted my phone a Samsung S22 ultra several times. The app is recognating some settings automatically but it doesn't accept my old password with 16 letters in a group of four with highfens in between. What shall I do, please? Something wrong with the server? The version of the app is 17.0 updated March 16th 2026.

I would like to sign in to my account, xxxxxxx@yahoo.com,but do not remember the password. _{email address username deleted}

Greetings, I'm some insight on having to constantly enter my password (ISP) to download email messages. Ever since I can remember when I started Thunderbird I would enter my ISP password for my accounts once and it would download the messages as long as Thunderbird was running. I think after a Thunderbird update, now every 10 minutes when Thunderbird checks for new email messages I'm prompted to enter my ISP password. I do not tell Thunderbird to remember my password and I'm not sure what has changed to cause this, any insight is appreciated!