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URGENT: Unable to Create Inbox Subfolder – “An unexpected error occurred”

Message:

Hello Thunderbird Support Team,

I'm experiencing a serious and blocking issue with Thunderbird after attempting to import a backup of my emails.

Whenever I try to create a subfolder under the "Inbox", I receive the following error:

swift Copiar código Error: An unexpected error occurred Failed to create subfolder: Inbox normalizeError@resource://gre/modules/ExtensionCommon.sys.mjs:875:12 wrapPromise/</<@resource://gre/modules/ExtensionCommon.sys.mjs:1025:23 This issue is preventing any proper folder management or import activity. It appears to be related to the newer Thunderbird builds (possibly version 128.x), and I suspect it may be linked to spam/junk folder configurations or internal handling of folder URIs. </p>

This is highly disruptive for daily operations, and I urgently need a fix or workaround.

Could you please advise on how to resolve this, or confirm if this is a known issue that will be addressed in an upcoming update?

Looking forward to your prompt help.

Thanks in advance, ALEX FORTUNATO

The first comment describes what is happening. We would very much appreciate your being able to correct this. We have lost much valuable information due to this....we have not been accustomed to something of this sort happening. I have now changed my schedule to go to Trash first and review all the subjects, then go to my inbox. To me, this is highly unnecessary.

Last weekend I had to verify a third party account via my Thunderbird email address. I tried six times and didn't receive an email. This was ridiculous. It had never happened previously. I double checked my back up Gmail account and the emails weren't there either which clearly demonstrated that I hadn't received them.

I spoke to the company today who could only keep reiterating that they'd been sent and they could "see" they had been received. The fact that nothing appeared in my Gmail account either meant nothing and the fact that this had never happened with Thunderbird previously also meant nothing. I was told in no uncertain terms that the problem was at my end.

The most annoying part is that for every other thing they use my Thunderbird email address without any problem so having been told that the problem was my end they had no answer as to why some emails arrived and some did not.

I was asked to contact Support to see if for some reason they'd been blocked.

Advice would be much appreciated.

This question is now over 10 years old: In the auto-complete of e-mail addresses, old invalid addresses keep appearing in this list that are not in any address book (any more). How can I delete one from the list, or perhaps all?

It's not mine, and I'm pretty sure the bug is far older than this. You send one email to a person and afterwards their email keeps popping up in suggestions even though you didn't save it in collected addresses.

The only solution offered is an extremely clunky, labour-intensive workaround. It's not the users' fault. When is this absolutely-not-a-feature getting the attention it deserves? The option Collected addresses should not work if it's not selected.

Yours in annoyance on a hot and sticky day.

When i delete an e-mail in Outlook or other, the same e-mail disappears in Mozilla . . . and that was not the reason why i came to Mozilla . . . did I something wrong ? ? ?

I tried to drag some old emails from one folder to another. In the process, they seemed to disappear. They are neither in the original folder nor in the destination folder.

I presume they must be somewhere in my system. Can you advise how I can search for them. I have tried using the senders' names but with no luck.

Thank you very much!

I am running Thunderbird 139.0.2 (64-bit). I have two address books. In Tools > Settings > General > Message List the box beside Show only display name for people in my address book is checked. Nonetheless, the Message List Pane displays several Contacts in my Address Book with both full name and email address.

If I right click on the name and email address in the Message Preview Pane and click Add to address book the name and e-mail address do not revert to Display Name only. If I right click them again there is still the Add to address book option, with no Edit Contact option, as if the Contact had not yet been added.

In some cases after adding the Contact to the address book there is only the Display Name in the Message List Pane but this display name is neither of my address books.

I sent an email to myself and got: Sending of the message failed. An error occurred while sending mail. The mail server responded: RCPT TO:<[email removed]@bell.net> User unknown. Please check the message recipient "[email removed]@bell.net" and try again.

How can I fix this?

Hi. For a long time, I've noticed that emails I send from home are sent, but those I try to send with the same settings do not get sent when connected to the Internet in 4 out of 4 cafes. My ISP, Zen, hasn't been able to explain why. I've tested whether Google VPN blocks it somehow, and it doesn't. I normally use Thunderbird. Today, I found that, in the same cafe, messages I tried to send using Thunderbird failed to send, whereas there was no problem with GMail, Proton Mail or Outlook. Any suggestions?

I am a long-time user of Thunderbird and have relied on the calendar application extensively. I recently had to purchase a new computer and had to install updated software for everything including Thunderbird. The calendar is giving me fits... When the computer is turned off, I lose all records of previous meetings as well as all scheduled meetings in the future (as well as any scheduled recurring meetings) along with the links to the online meetings. I assume that I have a problem in my settings but I don't know where to begin... I have looked for other similar problems on line and most seem to be associated with sync-ing with other calendar applications - but I don' use other calendar applications and don't sync with any other applications.

Any help would be greatly appreciated.

My gmail account has two Sent folders.

1) A folder Sent in TB. Its location in properties is (host)@imap.gmail.com/Sent. But its contents correspond to the gmail account's label [imap]/Sent.

2) Another folder Sent Mail in TB. Its location in properties is (host)@imap.gmail.com/[Gmail]/Sent Mail. But its contents correspond to the gmail account's System label Sent.

So gmail's sent mail appears in #2 - TB's Sent Mail folder - and TB's filters that run after sending mail don't run on it.

How can I straighten this out? Just swap the locations in the two folders' properties? That will make them incorrect but maybe make it sync correctly.

(background)

I'm still running Windows 7 (it works for me) and Thunderbird (version 115.16.2 (32-bit)) has been my e-mail client application for many years.

Inside Thunderbird I have a series of sub-folders (which I shall refer to as 'folders') named & arranged by years & months.

Any received e-mails that are 'personal' (i.e. not news items, previously OK'd advertising, or junk) get filed into the current month's folder (which is 'inside' the current year's folder). (Towards the end of a current month I create the next month's folder.)

I used a wired USB mouse with two buttons ('left' & 'right').

When things are working like they are supposed to (and I have received a piece of personal e-mail that I want to store) I 'left click' on the e-mail (in the 'inbox') and (while holding the 'left button') 'move' the e-mail into the current month's folder.

(the 'problem') Once in awhile I accidentally click the 'right button' during the process of moving an e-mail from the 'inbox' to the current month's folder.

To-all-appearances the e-mail 'disappears' though a few times I have found it in an 'adjacent' month's folder (I also look in the 'trash' folder').

So far my only 'solution' (I at least have a copy of the message) is to go to my e-mail server (I have it configured so that it does not automatically delete messages) and 'forward' the message to myself (in which case I am shown as being the 'sender' when the message arrives in the Thunderbird 'inbox').

(my question) Does Thunderbird have an (undocumented ?) 'disintegrate' action ... where a message can be completely erased as a result of an accidental right mouse button click ... or is there some other folder where I should look (other than 'adjacent' month's folders and the 'trash' folder) ?

(signed) Paul in Texas

Gmail is connected. Deleted letters in the trash have stopped loading. I haven't changed the settings. I just went in today, the folder is empty. If you go directly to Gmail, all the letters are displayed.

 Сведения о приложении

   Имя: Thunderbird
   Версия: 128.11.1esr
   ID сборки: 20250611182504
   ID дистрибутива:
   User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Thunderbird/128.11.1
   ОС: Linux 6.14.11-300.fc42.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Jun 10 16:24:16 UTC 2025
   Тема ОС: Adwaita / Adwaita