Форум спільноти Thunderbird

Hello Thunderbird Support, I am experiencing a severe IMAP folder synchronization loop with my Yahoo Mail account ([redacted]@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.

Hello. I regularly sign up for online conferences, then when I get the confirmation email with the details I can't transfer it to the calendar. I even tried saving the ical event separately but when I try opening it using Thunderbird I get an error message. The only way I found is to transfer the contents manually and create an event on calendar, which is time consuming. Anyone knows how to fix this? Thank you in advance

Hi, I have 2 Local Folders and an additional Local Folders1 folder. I need tol remove two of them so my Msg Filters work properly. Do I need to edit an additional file inn my Proffile folder? Need some guidance please. Am I not following rules and guidelines? Thanks

Disabled in a nursing home.

Hi David This is the last attempt I did but it failed. Enclosed is the screen shot you have asked for. Keep in mind my WIN 10 has 64 Bit but the last update from Thunderbird was 32 Bit

Heinz

Old PC died and will not start up. I bought a new PC and was able to recover most file in the initiating the new desktop. I installed Mozilla Thunderbird on the new PC, but when I opened it only 55 EMAILS were available with the oldest being about 2 weeks old dating back to July 16, 2026. Is there a time limit for maintaining EMAILS online? Also, all of my contacts and Calendar events are not available.

I had created several folders to save important EMAILS and none of those sub-folders are visible to me. How do I get to those folders and EMAILS? Contacts and calendar are not as important, but they were used all of the time to communicate and stay on schedule

I tried to import using the tool provided, but received the following message: Import failed unexpectedly, more information may be available in the error console.

I have lots of important information that I can't access!

Help

On Saturday morning 27 June 2026 I tried to login my Orcon email account via Thunderbird (which I have been using for a long time). But my login didn't work, I got a message saying "login to POP3.orcon.net.nz with username habitation failed." On 30th June 2026 I reported the problem to Orcon.

Orcon gave me the following settings for Thunderbird. I have done that and even made a new account: Incoming Server Type: IMAP Mail Server: imap.orcon.net.nz Port: 143 SSL: Off Authentication: On (username and password required)

Outgoing SMTP Server: Mail Server: smtp.orcon.net.nz Port: 25 SSL: Off Authentication: Off

Since then I have spent many hours and going around in circles with Orcon's Technical Support to resolve this, but no luck. They blame Thunderbird. I used Thunderbird Troubleshoot Mode. The message that comes up reads: login to server mail orcon.net.nz with username habitation failed. Please can you check that your server settings above are correct? And if there is a bug? Irma

hi :-)

My Thunderbird uses between 19 and 34 GB of RAM. It's cyclical (with a period of about 10 minutes).

What do you suggest?

Do I need to perform a performance diagnostic? https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance

Do I need to follow all the steps listed on https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems#Diagnosis_Steps, or can I skip some of them?

Been to various sites for diag info. I have uninstalled antivirus and tried it, no joy. I have done all the following to each folder - compess, repair, deleted old emails, etc. (I actually have rules that are to do this automatically). I have captured config info, uninstalled and installed fresh. Still have the problem. -- and finally restored so I still have email addresses, etc. etc. This problem has started for me with in the past 2 weeks.

1) ALSO note: I am running W11 home. Mozilla keeps calling this W10. I do not know what the difference is between Home and Pro, but I am planning to upgrade to PRO within 2 months (looking for a reasonable deal on the cost of the upgrade). 2) Wife's computer is W11 Pro, she does not have the problem.

I have set a custom theme on my Thunderbird on Linux. As you can see by the attached image though, the menu bar is hard to read when you get to the right side. Dark background and dark text doesn't really go together. Is there a way to make the background of the menu bars a solid color or something less see-through so the text can be read? I want a light theme, but I need to be able to read the menu.

Hello all,

Apologies if this is going over old ground. I've tried the usual Repair Folder fix without success and I'm cautious about trying anything further without some expert input for fear of doing more damage.

Thunderbird version: 140.12.1esr (64-bit) Windows version: 11 Server type: POP, messages not left on server Inbox " Folder properties" reports: 16384 messages. 13.8GB on disk

The Entire contents of Inbox disappeared after the following sequence of actions: 1. Tagging a selection of messages (in Inbox). 2. Making only those tagged messages visible (using Quick Filter). 3. Selecting all of the visible messages (select first, shift-select last). 4. Deleting the selected messages (Del key) The intended messages were successfully moved to the Deleted folder.

The Inbox now appeared empty. At this point only tagged messages were set to be visible but these had been deleted so an empty Inbox pane seemed correct. Resetting the tags visibility of Quick Filter did not make the messages reappear.

The messages are however visible and openable when doing either a straight folder search or when using a search folder. Inbox Folder Properties reports that the messages are still present and the reported size on disk seems appropriate for the number of messages.

Messages in all of the other folders are visible.

At this point I did a complete Export of the profile. When I discovered that Windows would not recognise the resulting .zip file I also did a straight copy of the Inbox file within the profile folder to a safe location (I understand that the export .zip file is intended for re-import to Thunderbird and that Windows might not recognise it).

I then did a Repair Folder (within Folder Properties dialogue). This made no difference although the size of the Inbox.msf file reduced dramatically (I didn't make a note of the before and after sizes).

I then quit and restarted Thunderbird several times. This at first made no difference. After perhaps 3 or 4 restarts however a relatively small number of files have reappeared in Inbox (a tiny percentage of the correct total). Curiously, most of these (but not all) are marked as spam. Ordinarily I would delete all messages marked as spam but there are probably some that I have missed. It looks rather as if the files which are now visible in Inbox are ALL of the spam messages plus a handful of others. Of the 172 messages which are now visible they were initially correctly reported in the folder pane as being 172 unread messages.

Another strange thing is that when selecting the Inbox on the folder pane, the small number of messages which become visible only appear after a delay of perhaps 10 seconds (previously this was instantaneous). When selecting any other folder, the messages are displayed instantly.

I'm not quite sure what best to do next. I haven't yet tried deleting the Inbox.msf file. Any wisdom will be gratefully received.

Thanks in advance.

I just added two new email accounts to my Thunderbird installation, which has been working with three accounts flawlessly for years. All my accounts are POP/SMTP.

Both the new emails are Google Workspace accounts for an in-home business. One uses (my) name@(domain) as the account name, the other uses info@(domain). The account using my name works fine, sending and receiving. But the info@ account does not display a Sent folder, and will not send messages. It looks as if it does, but they never show up. I checked the Account Settings and the two new ones are set up identically, and just like the other accounts that have been working just fine. Any ideas? Many thanks in advance.

win10/tbird v140.12.1.esr wont d/l from yahoo. logon appears ok but the d/l bar starts & then just times out. This just started 3-4 days ago. gmail & fastmail ok.

Thunderbird indicates that I'm not using a primary password and when I ask to see the password for my gmail account it asks for a PIN. I have no record of a PIN for Thunderbird. I'm instructed to go to setting>accounts to change the PIN. but cannot find it: settings>account settings lead me nowhere.

I am migrating from thunderbird flatpak to thunderbird linux repository and the British English dictionary, which is included in the flatpak version, isn't included in the linux repo version.

I can see there are two different British English dictionaries in the "dictionary and language packs" page.

Please can anyone help and tell me which British English dictionary is included in the flatpak thunderbird? I would like to use it with the linux repo version, I like that dictionary.

"connection to server pop.mail.yahoo.com timed out" I have been getting this message in the activity manager for about a week now. When I click get messages, it says down loading message 1 of 1, but nothing happens.

Hello all,

Following some changes in our organization, we had to create new email addresses with new domain names. We have kept the old ones until now but we decided to erase some that had not received emails for a while.

Since we did that, we have encountered some problems regarding one of our computer. We can't send emails because Thunderbird is asking us for the passwords of the deleted email accounts. When we click on cancel, a window opens saying (roughly translated from French): "The email could not be sent. Authentification to the SMTP (outgoing server) failed. Please verify your password and the "Authentification method" in the "Account parameters | Outgoing server (SMTP) menu." The email was sent from a completely different email address than the one linked to the email account.

We deleted the accounts and cannot access this menu. Has it happened to anyone? What would be the solution to be able to send email again on that computer?

Many thanks for all your help, Please ask me if you need anymore information All the best

Since Thunderbird update to Snap ``` 140.12.1esr (64-Bit) Mozilla Thunderbird Snap for Ubuntu ubuntu-snap-build - 1.0 ``` opening attachments ceased to work. What does NOT work (any more):

• Move mouse over attachment → right mouse → open (nothing happens)
• Move mouse over attachment → right mouse → open with (doesn't exist)
• Move mouse over attachment → doubleclick (nothing happens)
• Settings → Attachments → There is an empty box, and in the void beneath it, floating in empty space the text (backtranslated from DE): "Add a Filelink-memory service" or "Filelink-save service" or similar. The text is dead (not clickable), same for the empty box.

AFAIR, in the good old non-snap TB version, the box had file extensions and linked applications to open them. The box / links / extensions coud be added, edited, removed. But in snap crap it's all dead...

Any hints what I am missing?

I used to open attachments from received mails (like .diff, .patch), and also used it for final inspection of own attachments while composing mails.

Sometimes, the following message opos up: /run/user/1000/doc/1d06e601/binutils-sort-text.diff konnte nicht geöffnet werden, weil die damit verknüpfte Hilfsanwendung nicht existiert. Ändern Sie die Verknüpfung in Ihren Einstellungen.