Thunderbird Community Forum

When attempting to set up an e-mail account for Zoho e-mail I get an authentication error. It says: "Unable to log in. Probably wrong configuration, username of password." I disabled Account Hub, tried again, but this did not solve the problem, and I get the same authentication error. I tried several other things, using manual configuration, copying instructions from the Zoho website, but none of them worked. They all ended with the error message, "Thunderbird failed to find the settings for your email account." The server and port settings are correct. The username and password are correct. What is the problem?

Hello everyone

It's been for a few days since somehow it became unable to send mail. The error message is "The message could not be sent because we were unable to connect to the outgoing (SMTP) server smtp.gmail.com. The server may be unavailable, or the SMTP connection may have been rejected. Please verify that your outgoing (SMTP) server settings are correct and try again. Problem is I cannot see any mistake in my smtp setting. Some help much appreciated. Thank you.

Taka Jimbo

Thunderbird installed a new version and would not open until I created a new profile. Now all my locally saved email is missing. The only profile I can find is the new one for my email account, dated April 2026. Where is the old profile with all my saved emails? I have no email older than April 2026 in my Inbox. POP3 email, saved to my desktop computer, is gone. Please help me find them.

In Thunderbird, the "Play a Sound" feature has quit. I changed from 'Use the following sound file' to 'Default system sound for new mail' and back again. That didn't work. I tried changing the file in 'Use the following sound file'. That didn't fix it. I restarted Thunderbird and it was the same. I don't want to uninstall and re-install. Is there a fix?

Migrei do Windows para o Linux recentemente e preciso das pastas de e-mails e contatos do Outlook. Como importar ou converter arquivos pst do Outlook para o Thunderbird? Grato.

Thunderbird stopped syncing with my GMX email accounts (I have several) a couple of days ago. It keeps reporting that the attempted connection has timed out. I haven't changed any settings on either Thunderbird nor GMX. Any idea why and how to fix it?

I get the error "connection to server pop-server.triad.rr.com was reset" when running Thunderbird and then I get no email.

Don't know if it is relevant but I did try VPN beta in Thunderbird some time before the above error happened.

Regards Tom

PS I can't get any email if you respond to me there.

Recently switched ISPs to a fiber internet company. After the switch, now whenever I try access my comcast email tunderbird gives me a message that my IP is temporarily blacklisted. I get two messages. One is a windows notification that says the blacklisted message, and then a popup message from tunderbird that it cannot log in. I have contacted my ISP to ask them what's up with the blacklist, but what's weird is that I can seem to access these accounts fine through Outlook, which would seem to indicate that there is some issue with tunderbird. I'd really rather use tunderbird than outlook. Can somebody help me with this?

The few articles I could find on this all suggest changing the IPv6 setting but I checked that and it is already set to what they suggest.

I tried deleting the account and recreating it in tunderbird, but it won't go through it says it can't log into the account.

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

Good day, thank you in advance for your help.

I have two questions: 1. Do you find Thunderbird release [version number missing] better than ESR? Could you share your opinion?

It seems faster and applies all changes more quickly.

I will test it sometime if 32-bit and 64-bit versions are available simultaneously. I have no idea what kind of channel that would be.

Problem/Question:

In Thunderbird release 64-bit POP3, the font changes to blue for every second email (receipts). Can you tell me how to display every email in black? It's only the second email in the inbox that's displayed in blue (receiving emails). When composing, everything looks black. What do I need to change?

Question 2: Regardless of whether it's 32-bit or 64-bit, and whatever channel, I see updates to the latest version. The program itself has an option to view older updates, but everything is white. I only see white and nothing else. Is this intentional? I can't see the update, even though it's current?

``` thanks for the information

I am using version 140.9.0esr-bb20 (64-bit) 

There are three categories of messages I want to filter: 1. Messages where the Subject contains a known word.

   Action: delete  before downloading from POP server

2. Messages from senders not in my address books.

   Action: Move to Junk-folder [and if possible: only download header AND delete them from the server once they have been cleared manually from the junk folder]

3. Everything else

   Action: download the full message to inbox

I'd like to know the settings for __Each message filter __ Check for new messages every 1 minutes __Automatically download new messages __Fetch headers only and anything else that is needed.

I thought I could achieve this out by turning off "Automatically download new messages" and turn on "Fetch headers only". Then, explicitly ask to FETCH FROM SERVER in the filter to get the full messages or "DELETE FROM POP server" as needed. "Check for new messages every 1 minutes" is always on, so I assumed that the filters will be applied every minute. Instead, what I am seeing is that nothing happens, as if "Check for new messages every 1 minutes" does not even work. However, when I do a manual "Get Messages", things seem to work (mostly). If I check "Automatically download new messages" the 1-minute action do occur except everything gets downloaded, regardless of the "DELETE FROM POP server" filters. So it seems I misunderstand these setting. 

Any hints on how to get the requirements done will be appreciated

I recently created a Google Workspace account. There, I have a user profile with a custom email address. I've set up the new account in Thunderbird, and it is working as expected. If I send a message from my "external" account to the workspace account, it arrives, and I'm able to reply back.

One feature of Google Workspace is what they call "alternate email" addresses. They sort of work as an alias for the native address. I have created one such alternate. If I send a message from my external account to the alias, it arrives correctly in the workspace account. However, when I reply from the workspace account, it does not go back to the originating address, but instead it is addressed back to the alias. If I repeat the experiment from the Gmail web interface, it replies to the correct address.

I've downloaded all the headers, and the Return-Path tag is correct. I can provide the full header if needed.

It feels like there is an invisible forwarding action to get from the alias to the workspace account, and that the reply action is incorrectly finding the interim alias. But that doesn't really seem to be what I see in the headers - although I'm probably not the most expert reader of those.

And it isn't necessarily a Thunderbird issue. I can see that there could be something going on with Google. But this is a good place to start...  :-)

I have two outlook mail accounts installed in Thunderbird, with the same parameters (except of course login name and password). Only the mail account installed first, works. The other only shows its inbox but no other folders or message. If I test its connection, the account seems to be properly connected.

Next to the two outlook accounts, I have three gmail accounts installed in my Thunderbird. They work without problems.

What could be the problem with the outlook accounts?

Dzień dobry, podczas tworzenia wiadomości i próbie zapisania jej na później, otrzymuję komunikat:

Ostrzeżenie Błąd podczas zapisywania szkicu - W Twojej bazie kluczy nie można odnaleźć identyfikatora klucza „0xD3ADE4868E262032”.

Nie potrafię tego naprawić. System iOS na Mac.

Proszę o wsparcie.

Pozdrawiam

Hello, It's getting very frustrating some time hotmail folder/emails are there ans other times not, then some times it will start a downloading all messages folders as if it a new set-up. I have follower all info I can find but it just stays the same.

Kind regards Chris

Hi I wanted to add my @live.de (Outlook) email account in Thunderbird. I entered the email and got redirected to Microsoft oauth, which I granted. After some loading I was presented a screen, where I should enter my password and username (again). After doing so I see a "Exchange auth error". I guess this means I somehow got in the exchange funnel, which is not fitting for my private outlook account. I was left in this state with back bringing me to the first view (before oauth) and continue gives me the error.

I could solve this problem by disabling the new account setup hub and setting it up using the old one.

If this experimental feature is enabled by default, you need a "something is not working please take me to the old version" button in the footer. I did not find any ways to report this bug, so I hope here is the right place.

Hi,

I am trying to edit my message separator line (which I added many years ago). Now there is a big gap in the line and messages. How can I reduce this gap please? Any advice?

Regards,

LS

Some of them are Spanish (tilde, ¿, accents, etc.). Settings/about:preferences#general says my preferred language is English(US). How do I change the keyboard layout back to standard American English?