Thunderbird Community Forum

I've got 2 PC, both on the same version of W11 Home and TB?

On my PC that was install in 2020, I can see on each folder and sub-folder unread mail, total mail, and size of that folder (see uploaded image). On my wife's PC, installed in March of this year, only can show the total mail and folder size?

I've Googled how to do that and of course there is no such steps I can do?

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To show the unread message count in Thunderbird's folder pane, click the three dots icon ( ...) at the top right of the folder pane header and select "Folder Pane Columns" or "Show total message count". Some versions may also allow you to enable this view by right-clicking on the folder pane header and selecting "Folder Pane Columns," then choosing to show "Total" and "Unread".

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Right off the bat, no "Folder Pane Columns"???

I suspect somehow this was removed from TB, so new installs this year can't get to it?

I can't even get to that on my PC from 2020 to turn them off?

Is/was there another way? Doesn't seem I have an ADD-ON to do that and I can't locate one that would do it?

Is there an answer to this or is this just the way it is (not)?

PDF filter doesn't work

Trying to refine my search to get only emails with PDF files attachment, only get an empty list when mails with PDF are in the base for sure.

Step by step with screenshots here attached sorted by A, B, C.

A - Basic search with "pdf"

     => 480 attachments files in emails 

B - Filtering A search to get only mails from year 2025

     => in 2025 only 27 emails with attachment - We see in the list result some emails with PDF files attached to it.

C - Trying to get only emails with PDF types attachment, clicking on the top left filter get nothing

      => It's a bug i guess.

Ubuntu 24.04.3 LTS Thunderbird 140.4.0esr (64 bits)

On 18 November 2025

the new beta mozilla has not copied my folder inbox folders, all past emails are gone. I want to revert back to the old system but it wont allow, and I have tried to import the old folders but that has not worked, all it has done is create 2 more copies of local folders (twice). Please help as the old emails are important.

Yesterday was fine, but today (11/21/25), I can't send emails with attachments. It's like dial up service without the beeping.

A simple email with a simple image sits and sits and 20% sent, then 27%, then 35% .... then it may go through. Maybe. AND then it tells me that it can't save the sent message.

Slow as a rock.

I want to block a sender. The advice on line is to right click the email and create a filter. When I right click the list that appears has no option to create a filter.

How do I block an email, please?

My Thunderbird mail, which has been set up as POP until now, started giving this message yesterday morning: "The connection to the server mail.munkebo-borger.dk was reset." After that, it no longer downloaded any mail from the server. I have now switched Thunderbird to IMAP, and everything works fine since then. But what is the reason that it will no longer run POP, which it has done for several years? Best regards Tommy Jeppesen

Hi, I have the latest Thunderbird on Win10, HP laptop. It all worked fine until a week ago when it started to lose passwords. We have Telia Sweden as provider. I have changed the passwords both in the Telia account and in the Thunderbird account. But the passwords continue to be lost meaning that Thunderbird ask for my password over and over again. Despite the fact that I enter it and clicks to have it stored. That does not help at all. What to do? Leave Thunderbird? When using the Telia webmail it works fine. How to remedy??

Since last night my emails in 3 accounts won't send in thunderbird. I get the following message

the message could note be sent because connecting to the outgoing server SMTP mail.optusnet.com.au failed. The server maybe unavailable or is refusing SMTP connections. Please verify that your outgoing server (SMTP) is correct and try again.

The provider Optus has confirmed it doesn't have any issues.

Is there a problem with this with Windows 11 which i have just downloaded 5 days ago?

Does anyone have any suggestions?

I was trying to change the time emails are kept on the server so I went into "Account Settings" and now Thunderbird is locked onto this page. I get a "Mozilla Thunderbird not responding" message when I try and click on anything and I can't get out of this page nor access my Inbox. I've tried starting Thunderbird in Safe Mode which didn't work. I then uninstalled and reinstalled the latest version of Thunderbird but when it starts it goes straight back to the frozen "Account Settings" page. I've checked my profile and there is a new profile that was created with today's date. There is also a profile from June 2025. If the old profile contains all my emails and folders up to yesterday, that would be OK.

Hey, after I opened Thunderbird earlier today, all my public keys and my own private keys have simply disappeared. Thunderbird says it can't find my private keys. I didn't change any settings. What can I do?

I've been doing this for (literally) decades.

If I initiate a search in all local folders, for example all messages to, from, cc or bcc a particular e-mail address, the results (as of about a week ago) now ONLY return messages found in Inbox or Trash. Also, after returning those results, the search indictor continues to 'spin' as if it's not done but still searching. None of the messages in my Sent folder appear in the results.

If I change my search to specifically look in the Sent folder, I get all the remaining messages I'm looking for. But it isn't helpful to have to perform two separate searches to get these two separate result sets.

I've tried quite a few things. Any ideas?

J'ai dans mes carnets d'adresses Address Book récupéré par Carddav il est marqué comm carnet par défaut. Lorsque je crée un nouveau message, il n'apparait que très burèvement puis est remplacé par un autre carnet. Comment faire pour qu'il apparaisse tojours por pouvoir slélectionner mes correspondants ? Merci de votre aide.

I am getting the following error message in Thunderbird. Unable to download email to mailbox. Please make sure that the file system has write permissions and that there is enough disk space to copy the mailbox. Write permissions are available and there are 735 GB free.

So I have a self hosted Exchange and I have no problems using it from apps like Google Mail, Outlook and such, plus I can login directly to its .../EWS/Exchange.asmx through a browser. However, when trying with Thunderbird 145/Linux, I always get that username or password are incorrect, but it doesn't tell me exactly what went wrong and how it tried, so I'm in the dark why it is happening. Note: exchange's url is on a different domain than my account.

Basically it's either this message: Authentication error.

Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIMsgAccountManager.createIncomingServer]

Or similar if I try to get message from inbox.

Also weird things happen during configuration, like attached image (note that I've tried different URL permutations)

TLDR; how do I diagnose the issue, or ever better, how to connect? TIA

The Android Thunderbird app has recently started bunching emails together in the inbox. I'm not talking about displaying a threaded view. What I'm getting is that when I select an email to view, Thunderbird opens up a small group of emails from the same sender. It doesn't seem to have any rhyme or reason to it either... emails displayed might be from the same day or different days. It's extremely irritating! It means that in order to view an email, I have to poke it once, and then again... assuming that the one I want to read is at the top of the displayed list. Why has TB started doing this, and how do I stop it? Thanks in advance, Ian

Dear demons, when will you release a new update that will fix the old update? When will all the normal features be working? It's time to get back to real work for the benefit of society.

I recently installed Thunderbird for use with Gmail. I have created several message filters, but they keep disappearing. I have found that multiple filter files have been created:

Directory of C:\Users\shrdl\AppData\Roaming\Thunderbird\Profiles\ae352sn6.default-esr\ImapMail\imap.gmail.com 2025-10-28 22:30 385 msgFilterRules.dat

              1 File(s)            385 bytes

Directory of C:\Users\shrdl\AppData\Roaming\Thunderbird\Profiles\ae352sn6.default-esr\Mail\Local Folders 2025-10-28 19:07 241 msgFilterRules.dat

              1 File(s)            241 bytes

Directory of C:\Users\shrdl\AppData\Roaming\Thunderbird\Profiles\ae352sn6.default-esr\Mail\pop.gmail.com 2025-10-26 11:03 0 msgFilterRules.dat

              1 File(s)              0 bytes

Any idea why this is happening? Thanks