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Hello Thunderbird Support, I am experiencing a severe IMAP folder synchronization loop with my Yahoo Mail account (paulpersonne519@yahoo.fr) inside Thunderbird. Yahoo Support claims the issue is caused by Thunderbird's folder mapping, so I am reaching out to you for a solution.

1. 1. The Problem:

The system-protected folder "Bulk" (Spam) has somehow been moved or mapped as a subfolder inside the "Trash" folder.

• In the Yahoo Mail Web UI (Chrome), the subfolder is invisible, but the Trash directory shows an arrow (^) indicating a child folder exists.
• In Thunderbird, the Bulk folder is clearly visible inside the Trash folder, marked with the flame (Junk) icon.

1. 1. What goes wrong:

When I delete spam messages via Thunderbird, they get trapped inside this nested Trash/Bulk directory. If I try to delete or empty it, the emails disappear but the folder itself cannot be removed.

1. 1. Steps tried so far that failed:

  1. Attempting to delete or rename the Bulk folder inside Trash gives the server error: [CANNOT] DELETE failed - Mailbox is reserved.
  2. Using Shift + Delete on the folder is rejected by the Yahoo server.
  3. Unsubscribing from the folder via "Advanced IMAP settings" -> "Show only subscribed folders" fails; Thunderbird re-downloads the structure on the next sync.
  4. I have completely deleted my old Thunderbird profile folder and created a brand new one using thunderbird.exe -P. Upon adding the Yahoo account via OAuth2, Thunderbird immediately pulled the same broken Trash/Bulk structure from the server again.

Since Yahoo refuses to help and claims Thunderbird caused this mapping loop, is there a hidden config setting (about:config) or a database override in Thunderbird that can force the server to release or move this reserved folder back to the root directory? Thank you for your assistance.

just got Thunderbird, i added my outlook email then got to the "connect your email setting" then i clicked continue cause i wanted to use imap and got a "Authentication error". I got Thunderbird on a different device and used my gmail on that device and it worked fine. Only get the error when i try to use my outlook email and i don't know what to do.

There was an earlier Case with the exact same name as what I named this case which was archived back in 2025. I have been living with this same problem since last year also. In the previous case there was reference to "downgrading" to an earlier version of TB, but there have been a bunch of updates since then so I doubt that would fix my problem because that earlier version is now over a year old.

I have one Gmail folder that correctly has one folder label "Junk." However, I have 4 folders that are AT&T related (2 from the domain "sbcglobal.net" and 2 from the "att.net.") For some reason when I set these folders up years ago they started out as labeled "Spam" instead of "Junk." Of those 4 folders 2 of them have the duplicated "Spam" folders, one from each domain."

When I go to Folder Properties I see "imap://XXXXX%40sbcglobal.net@imap.mail.att.net/Junk" on one of these Spam folders and "imap://XXXXX%40sbcglobal.net@imap.mail.att.net/Bulk" in the other. And the same "Bulk" vs "Junk" issue is in the other domain as well. All are named "Spam."

Can I simply delete one of these folders that are named "Spam" in each domain? Does it matter whether I delete the one ending in "Junk" or the one ending in "Bulk?"

Thanks.

I can't listen to a YouTube video when I open a new tab. Also the video stops. When I use my android power button to close screen. I was able to do this both these things on my old Samsung ao3 phone. Now on my Samsung a16 I can not

Здравствуйте у нас перестали работать метки помечаешь письмо меткой и оно сначала уходит куда надо в папку с этой меткой а потом заходишь она опять в изначально метке стоит, до 28 июля все было норм а потом начало криво работать и поиск тоже не все письма ищет раньше все показывал а теперь не все и приходиться искать по тексту сообщений тогда находит.

I know my username and my password. I don't have my phone I used for verification or any access to my recovery methods I do know when I made this account, not the exact date but I can give a time frame. Please help me, I've been trying so hard with no luck.

For a few days I'm having trouble with Asana mails (notification mails informing me about replies, comments, etc).

Clicking on the mail to view it freezes Thunderbird for a good 5 seconds while one CPU core spins at 100%. This only happens with Asana mails (or at least I haven't found any other problematic senders).

I guess it's a problem with validation or parsing of the mail's HTML content. But I don't know how to debug this.

I can't pinpoint exactly when it started happening, but it was around the time I've switched to the [new snap release track](https://support.mozilla.org/en-US/kb/channel-choices-thunderbird-snap-and-flatpak#w_snap-channel-changes-in-2026). But since this happens with Snap and Flatpak I think the culprit may be the 153.0 update.

Things I've tried:

• Clearing cache and msf files.
• Troubleshooting mode with add-ons disabled.
• Reinstallation. Creating new profile + importing old data.
• Switching from Snap to Flatpak
• Switching Message Body display to Plan Text or Simple HTML.
• Disabling HW acceleration.
• Checking console for suspicious output.

Anything I can do to create handle the problem or collect information for a proper bug report?

I recently added a email address to my thunderbird email and it brought forward a lot of messages from Yahoo that are spam. I would like to block them and instructions I have were dated 2016 from Mozilla. Is there a new instruction on how to block?

Hello, When I open Thunderbird, I get redirect on the browser to sign in into my Yahoo account. I enter my logins and a pop-up window opens and says that there is no application able to open whatever it wants to open. I already checked the forums concerning the Oauth2 login security for Yahoo, and tried several of the advices, but I always get stuck at the same stage. My operating system is Ubuntu 24.04.4 LTS Thunderbird version 153.0 Am I missing an application? Or is something wrong with my settings? Thanks for any support.

I have a ton of email accounts in Thunderbird on Mac. I recently added a new account, and it constantly pops up the Authentication Required - Mozilla Thunderbird window. Below that it says: https://OURURL is requesting your username and password. The username and password are both stored in the passwords, and I don't get the password needed message, and can email and receive in between the annoying pop up.

I have this same issue on a new computer we just set up with other email addresses too, so I think it has to do with some automatic setting when adding a new account that happened in the most recent release. I do not get the authentication message for any of my older accounts.

I tried all the things I could find online - deleted and re-added account, deleted the password files in the profile folder, reset the startup cache, etc. I searched the support base, and can't find anything

We host our own email through cPanel. All the server settings are correct, or we wouldn't be able to use the email address at all.

As described, I (changes being intended as temporary) changed the maximal size for the sidebar to open upon hover. Only when, at that length, I try to revert the change, the sidebar closes before I can "grip" the edge of the sidebar to shrink its length.

My issue is not that I cannot fix this change. My issue is that my change isn't permenant. I followed the standard steps of "Right-click anywhere on Sidebar > select 'Customise Sidebar' in menu > let Sidebar collapse > in 'Customise Sidebar' panel deselect 'Expand sidebar on hover' option > close 'Customise Sidebar' panel > pick up the RH edge of now stationary Sidebar by hovering mouse until the 'gripper' symbol (double-headed arrow) appears... drag RH edge of Sidebar to desired new max-open width."

The issue is that, after doing this, the sidebar reverts to taking up half the screen once I re-enable "Expand sidebar on hover" and reversing the steps listed above.

Any help would be appreciated! I'd rather not have to re-install.

Hello,

The new August 10 release tags every message in red when it's clicked on.

Now the messages I DID tag don't stand out because they're all red. I cannot find anything in Manage Tags to undo it tagging every message to no avail.

How do I stop every message from being tagged red on its own?

Thanks, Theresa

Account Settings > + Add Account > Mail Account > filled in Full Name and gmail e-mail address in Mozilla Thunderbird Account Hub > Continue > Account settings found automatically > Continue > Connect your e-mail settings "Waiting for authorization in login popup..." > website appears on my Brave web browser > Mozilla Thunderbird Email wants access to your Google Account > Select what Mozilla Thunderbird Email can access > Select all > Continue > error appears "This site can’t be reached localhost refused to connect. Try:

Checking the connection Checking the proxy and the firewall ERR_CONNECTION_REFUSED" > Mozilla Thunderbird Account Hub, Connect your e-mail settings page says Waiting for authorization in login popup with spinning circle still there. Any simple, step by step, instructions to get my gmail account added to Thunderbird would be much appreciated. Thank you for your attention to this matter.

Hi everyone,

After a recent series of updates to both my mouse and Firefox, my mouse no longer scrolls within Firefox. The mouse is Logi wireless mouse. Firefox is the latest version. The mouse scrolls fine in other apps, like WhatsApp, Outlook, Word etc. but not in Firefox.

When I try to scroll in Firefox, it stutters, jumps and will continue to jump even when I stop scrolling on the mouse.

I have spoken to Logi and there is no issue with the mouse itself.

I have tried Troubleshoot and Private mode, but still the same issue, so its not an add-on or extension problem.

Is anyone else having this issue over the last couple of days, or have any ideas on how to get back to smooth scrolling?

Thank you, Graham

I wanted to export my address book from my Windows10 PC, after a while I got an error message, something happened during the attempt. Since then I cannot start Thunderbird anymore. The program does not respond. So I can't find the Thunderbird version.