Thunderbird Community Forum

I'm running Thunderbird 140.3.1esr (64-bit) on Windows 11. Possibly because I was changing some settings, possibly because of a Thunderbird update, there are a couple of wonky things going on in my Folder Pane and elsewhere. Among them is the fact that one of my "Archives" folders now has a "Sent" icon instead of an "Archives" icon (see attached). Does anyone know how to fix this? I've tried the following: 1. Repairing the Thunderbird folder. 2. Restarting Thunderbird and my computer. 3. Installing the latest version of Thunderbird (without uninstalling though).

Hi, I keep getting the following message when I try to excute Thunderbird on my Windows 11 desktop:

"Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window."

I have gone off to Taskbar and looked for Thuderbird in the list of programs. It does not appear!

I have restarted my desk top, executed Thunderbird abd I get teh same message.

I have deleted Thunderbird from the desktop, shut down the PC. Restarted the PC and downloaded Thunderbird. I still get the same message when I execute it.

What else can I do about this?

Thank you

Hani

I thought for sure that Xfinity was moving messages to junk despite everything. It turns out Thunderbird is doing it. I turned off every setting I could find to keep TB from trying to filter junk. I reset training data. Still perfectly normal messages are sent to junk, and *even marking it as NOT junk, and even the address in the address book* TB moves the message to junk.

Problem in Thunderbird after creating a new email account from Proton Mail - Per9g@pm.me . Not receiving/not retrieving my emails from my email account, but can send emails from it. I have used the code from Proton Mail Bridge in the setup. See technical information below (account9): Programinfo Navn Thunderbird Version 140.3.1esr Build-ID 20250929214837 Distributions-ID Opdateringskanal esr User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Thunderbird/140.3.1 Styresystem Windows_NT 10.0 19045 Operativsystemets tema Launcher Process Aktiveret Multiproces-vinduer 0/0 Fission-vinduer 0/0 Aktiveret som standard Fjern-processer 1

Virksomhedspolitikker Inaktiv Google Location Service-nøgle Mangler Google Safebrowsing-nøgle Mangler Mozilla Location Service-nøgle Mangler Fejlsikret tilstand false Hukommelsesstørrelse (RAM) 7,9 GB Ledig diskplads 228 GB Konti for mail og nyhedsgrupper ID Navn Indgående server Udgående servere Navn Forbindelsessikkerhed Godkendelsesmetode Identitet Navn Forbindelsessikkerhed Godkendelsesmetode Som standard? account2 Lokale mapper (none) Local Folders 0 passwordCleartext account3 Pggotfredsen@youmail.dk (pop3) pop3.mail.dk:110 alwaysSTARTTLS passwordCleartext Per G Gotfredsen <Pggotfredsen@youmail.dk> asmtp.mail.dk:587 alwaysSTARTTLS passwordCleartext true account4 p.gotfredsen@icloud.com

smtp.mail.me.com:587 alwaysSTARTTLS passwordCleartext true account6 Pergg@live.dk (imap) outlook.office365.com:993 SSL OAuth2 Per G Gotfredsen <Pergg@live.dk> smtp-mail.outlook.com:587 alwaysSTARTTLS OAuth2 true account9 Per9g@pm.me (imap) 127.0.0.1:1143 SSL passwordCleartext Per G Gotfredsen - Per9g <Per9g@pm.me> 127.0.0.1:1025 SSL passwordCleartext true Biblioteker Bibliotek Status Forventet minimumsversion Version i brug Sti RNP (OpenPGP) OK 0.17.1 0.17.1.MZLA.140.3.1esr.botan C:\Program Files\Mozilla Thunderbird\rnp.dll OTR Kunne ikke indlæses. OTR chatkryptering vil ikke virke. - - -

I seem to recall that in the past I was able to change my "From" email address to another one for a 1-time use. Either I forgot how to do that or that option is no longer available. Can you tell me how to do it? I want to use an address that cannot be tracked for some emails (xx@duck.com). Thanks.

I cannot download e-mail from Mozilla Thunderbird. It says "Done" in the lower left corner and will not download when I hit the Get Messages key in the upper right corner. Please help me to be able to download my email.

Lightning Strikes again.

As soon as TB upgraded to 143 I had the following problems:

1. Half my folders disappeared. In this day and age, where emails are "official documents" to prove communications.... 2. I could not delete any email, folder. 3. I could not create a folder.

So, I deleted that installation and reinstalled TB.

Same issues. NO CHANGE with a clean install.

I have two Gmail email addresses. One is used for important messages. As of last Thursday I am not receiving some emails sent to this account. I asked sender to use secondary email and they come through. I’m very concerned that I’m missing important messages and need to get this corrected quickly. Please help if you can. If I need to delete Thunderbird I will but hope not.

Suddenly I am not receiving emails from my church and financial advisors (especially daily and weekly newsletters). They are NOT going into spam; I'm stumped. Appreciate your help.

In Outlook, it would say that "I replied to this message on xxx" in the header (not sure if that is what it is called, but near the top). I found it helpful to at least see if I have already replied to a message received. Is that feature available in TB?

Hello all!

I use Thunderbird as a local archive for my email. I have two accounts in the application: my home email via my ISP (POP) which I predominately use and my gmail (IMAP) which I don't generally use. There are years of messages in folders and sub-folder under the POP account, but nothing under the IMAP.

I’m up to date with Thunderbird at v140.1.0esr (aarch64) on my iMac with Sequoia 15.8.

On 07/22/2025 I went to download some messages via my ISP POP account and saw that a whole bunch of my email folders no longer had any subfolders and were empty of any messages. Some were also duplicated. Please see the attached image.

I haven’t changed any settings in years, and I do not have any add-ins. One of the nice things about Thunderbird has been its solidity and simplicity.

After every session, I would empty my trash and compact.

Suddenly my email seems to be gone along with sub-folders while top level folders are duplicated.

Wondering if anyone has any suggestions on how to troubleshoot this? Since I don't do anything fancy with the application and with the suddenness of this issue, I can't image I'm the only person having it? I’m quite concerned I may lose many years’ worth of messages.

Thanks much in advance! CPRoot

This pop message appeared about 4 hours ago. I still cannot recieved email. Do you know why and how long it before the system is working again.

Thunderbird Alert from account peter@pfirving.com: Account is temporarily unavailable.

I have used Thunderbird to manage my google calendar on PC, windows 11, for years. It seems now that when I add an event, hit save and close, it is not saved. All the events show. I can add events on my phone, and they show up in the calendar on Thunderbird, instantly. I just can no longer add events. I can try, but when I save, they do not appear in the Thunderbird calendar, or in Google. I did just recently change my password in Google, and had to re-authenticate Thunderbird, I suspect that's the instigator of the issue. I just feel I'm missing something. One note-if I click on "add account", there is no option for calendar anymore. Maybe this is gone.

I have previous ask questions on how to transfer profiles, local folders, sent messages, and all address from my old Windows 10 PC to a new Windows 11 PC. "David" provided a very help way to transfer the profiles between machines which helped immensely. However, I still do not seem to have the address book file(s).

Here is where I am and what I would like to be able to do.

When I first installed Thunderbird on the new PC, I set it up as an IMAP account with comcast.net. The contacts in the address book were showing. When I copied my Thunderbird profile from the old PC to get my Local Folders, the address book was gone. I repeated the install process and copying process to make sure I was not making an error. The results were the same each time.

What I would like to do is to find and directly copy the address file(s) from the old PC to the new. Is this possible and where are they located?

Thank you in advance to the time and patience to answer my question.

Mike Jacks mleeja@comcast.net