Thunderbird Community Forum

End user here, with Thunderbird for years, now on several machines that I use. Keep getting the warning window about "ESR" change. I have no wish to re-install Thunderbird, on each machine, nor to go beyond the normal updates. Can't tell which "channel" I need to choose. Unwilling to just guess. Could re-install on all five machines, if that's truly necessary. Hope not. An explanation of the simplest way to dispose of this issue, is the help I'm looking for. I think I'm currently set to the lower case address. And arranged such that each machine updates to the current content.

Quick Filter does not return correct results in Unified Inbox (Thunderbird 140.12.0 ESR)

I'm using Thunderbird **140.12.0 ESR (aarch64)** and believe I've found an issue with the Quick Filter when searching the **Unified Inbox**.

• • Steps to reproduce:**

1. Open the **Unified Inbox**. 2. Open the Quick Filter bar. 3. Enter a search term (e.g. "maddy").

• • Observed behaviour in the Unified Inbox:**

• With no "Filter messages by" options selected, entering a search term does not filter the message list.
• Selecting **Sender**, **Recipients** and **Subject** still does not return the expected email.
• Selecting **Body** changes the results after a delay, but the expected email is still **not** returned.

If I open the **actual Inbox** containing that same email and repeat the search:

• The expected email is found using **Sender**, **Recipients** and **Subject**.
• When **Body** is selected, the search takes longer and eventually returns additional matching messages, including the expected email.

This behaviour is reproducible with multiple search terms and suggests that the Quick Filter does not search the **Unified Inbox (virtual folder)** correctly, even though the same search works in the underlying physical folder.

Could you please confirm whether this is a known issue or a bug?

I got an eMail notification about an upcoming update for Thunderbird snap/flatpak configs, but I don't see any entry for Thunderbird in my "~/.var/app/" directory. There is an entry for Firefox, but nothing for Thunderbird. Yet Thunderbird still updates regularly and successfully.

What should I do, in order to conform to the eMail notification instructions?

Running the command "snap info thunderbird" returns the following --

name: thunderbird summary: Mozilla Thunderbird email application publisher: Canonical✓ store-url: https://snapcraft.io/thunderbird contact: https://www.thunderbird.net/contact/ license: unset description: |

 **ANNOUNCEMENT:** The snap channels are changing. Action is required by July 21, 2026
 to stay on ESR.
 Read more about this change:
 https://support.mozilla.org/kb/channel-choices-thunderbird-snap-and-flatpak
 
 Thunderbird is a free email application that’s easy to set up and customize - and
 it’s loaded with great features!

commands:

 - thunderbird

snap-id: k1Ml1O9GzSO2QftV0ZlWSbUfQ78nN460 tracking: latest/stable refresh-date: 12 days ago, at 06:38 CST channels:

 latest/stable:     140.12.0esr-1 2026-06-16 (1155) 221MB -
 latest/candidate:  140.12.1esr-1 2026-06-29 (1170) 221MB -
 latest/beta:       ↑                                     
 latest/edge:       ↑                                     
 monthly/stable:    151.0-1       2026-05-20 (1120) 226MB -
 monthly/candidate: 151.0-1       2026-06-05 (1146) 226MB -
 monthly/beta:      153.0b4-2     2026-06-30 (1173) 239MB -
 monthly/edge:      ↑                                     
 esr/stable:        140.12.0esr-1 2026-06-16 (1155) 221MB -
 esr/candidate:     140.12.1esr-1 2026-06-29 (1170) 221MB -
 esr/beta:          ↑                                     
 esr/edge:          ↑                                     

installed: 140.12.0esr-1 (1155) 221MB -

For five or so days, when I go to send an email on my iMac, I get a message saying SMTP server won't send it. If I go to webmail, it sends, and if I use my iPhone it sends. Rogers/shaw has walked me through testing and nothing is wrong their end. Is anyone else having this problem?

Full errror: Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.

Operating system Windows 10. I have Thunderbird installed on three computers. Two on Windows 10 and one on Windows 11. I have two accounts Helen and Kevin. I have no problems with my Kevin account on the there computers. The error only occures with my Helen account and only on the Windows 10 computers. Not the Windows 11 computer. Can you fix this?

I have used Thunderbird for years with few problems. This evening when I opened it, my inbox was completely empty. I tried all of the suggestions of recovery tools, etc. Nothing worked.I logged in to google and checked my inbox there. Also empty. I recovered most of my emails from the All Mail folder but wonder what caused the problem so I don't see it again.

Downloading messages is now noticeably slower on an older desktop if the 'Inbox' folder is selected/focus. If focus is changed to a different folder (i.e. 'Sent') the message downloads become blazing fast.

Deleting messages seems slower as well and I think it is related. May involve inserting/deleting entries in the grid.

I changed my yahoo mail account (xxx@yahooo.com) password to counter a threat. How do I change the pw on my Thunderbird account xxx@yahoo.com? I seem to need to provide a pin, but I don't have that.

I created a user profile for IMAP and all was OK....Until I deleted the profile for POP and I lost all e-mail folders that I didn't move to IMAP. My PC is running Linux Mint. How do I get my lost e-mails?

Let me explain there is some one with the following email:

noreply@redcarpetradar.robly.com

Whatever anyone does do NOT click on their links I believe it's a criminal organization trying to get to my account.

I know many of you may not be in my situation but I'm a bit job hungry cause financial hit really hard. I clicked on link without looking and the site pretended I needed to fill a job application out. So I did without looking to see who sent it. Yes, STUPID me.

For some reason I marked as junk and it's not going to where I need to and that is trash and immediately delete it. I try and see if I can setup a rule for that. But wondering if there a extension that might do a better job. I tried to unsubscribe but these guys keep hitting back. That one sign of hackers trying to penetrate.

So now I'm wondering is there anything else I might be over looking. One think I keep thinking about is why NOT put something a tool that will do similar to mxtoolbox. With AI out there it's going to get harder to keep these criminals out of our inboxes.

I appreciate any feedback.

I need to use the offline MBOX folders of several email accounts that I access via IMAP to migrate the contents to a new provider. There are no files in my Thunderbird profile directory tree with the extension .MBOX (under Windows 11) but I have some fairly large files of the form: <Thunderbird profile>\ImapMail\<IMAP server>\INBOX and <Thunderbird profile>\ImapMail\<IMAP server>\Sent are these the MBOX files? Can I safely ignore the .msf files? A further problem is that I have more than one account on the same server, but the second account only appears as: <Thunderbird profile>\ImapMail\<IMAP server>-1\INBOX and <Thunderbird profile>\ImapMail\<IMAP server>-1\Sent How can I identify the corresponding e-mail accounts?

送信トレイが消えました。 今まで送受信できていたメールアドレスがいつの日かメールの受信ができなくなってしまったため、ログアウトを行い、再ログインしたのですが、送信トレイの作成がされなくなりました。 メールを送ると添付画像のようなエラーが出てしまい、送信したメールを残すことができない状態になっているので改善策を教えてほしいです。

"Hello, I am using Thunderbird version 140.12.0 ESR 32-bit. I would like to install Thunderbird Setup 152.0. What are the advantages? Disadvantages? Is there a particular installation procedure?"

Hi,

I wanted Thunderbird to stop downloading messages from an old gmail account, but wanted to keep a kind of archive, so what I did was dragged all the account folders (Inbox, Sent, Trash) to Local Folders so that I can continue to reference downloaded emails (the account was using POP, not IMAP).

I'm on Windows 11. Inbox file is basically the same size as it used to be (just now in Local Folders) but Sent, Trash, other subfolders have all almost exactly doubled in filesize compared to what they were before I dragged (moved) the folders to Local Folders. I don't think there are doubles of messages when I look in Local Folders or anything.

Any ideas why the double filesizes? All the .msf filesizes are like, 15% smaller for some reason.

Thanks.

Why doesn't Thunderbird have a recall feature where I can recall and given sent email like those in Outlook and Exhange has?

You know there is good reasons for wanting that ability and be supprised to see how many people wish they didn't send that email.

Every time I shut down my Windows 11 PC (25H2, x86-64), it gets stuck and states "This app is preventing shutdown", listing Thunderbird as the application that is the cause for the hold. If I don't react to this and force close Thunderbird at this point, my PC does not shut down. (Annoying if I hit "shut down" and walk away expecting the shutdown to complete.)

If I close Thunderbird before shutting down, Windows proceeds correctly.

How can I diagnose why Thunderbird seems to hold Windows active?

I had an account for my business. The account was hosted on Google; but was listed among my Tbird accounts. I closed the business; closed the Email account on gmail; and, I deleted all the folders, and the like from my Tbird client, every reference to the deleted account.

I continually get requests to login to my account. See the attached image.

Does anyone have any idea as to what I missed?

Thanks!

Is there a way to make Thunderbird check the server Junk folder when I open the Thunderbird Junk folder? When I empty my Junk folder, sometimes it will find there are more on the server and delete those too, so I never get to see them. Thanks