Thunderbird Community Forum

I just purchased a new laptop and am trying to get Thunderbird up and running. I have an outlook email account and use it's calendar. On my previous laptop (manjaro linux) I ran Thunderbird version 138.0 which allowed me to install TBSync and customize via the chrome file. It worked great at bringing the calendar over to Thunderbird. Now, on my new laptop (also Manjaro Linux) the package manager is only presenting version 139+ to install but TBSync does not work on this version of Thunderbird and I can't figure out how to install Thunderbird version 138 on the new laptop.

So, I need help either syncing my calendar in thunderbird version 139 to my outlook account or on how to install thunderbird version 138 so I can add TBSync. I've downloaded the file for version 138 but don't know how to install it. This shouldn't be so difficult.

Your assistance is greatly appreciated.

I believe this started with this upgrade to the client. I routinely was able to select a piece of text in an email and click the Insert Link... button, fill in the data, and click OK to embed a link.

Now I select a piece of text, press the Insert Link button, and Thunderbird hangs, requiring Task Manager to kill the program.

Embedded links already in i.e. templates work fine, but cannot be edited or upgraded.

Anybody else seeing this, or am I (typically) just being stupid about something?

Thanks John

I'm trying to connect Thunderbird to my Mailcow server SOGo Calendar, but it does not work. It's not a typical problem, because SOGo generates for me two CalDAV links to connect this: 1. Link for signed in users (with RW access). 2. Public access link (with RO access). I want to manage my own calendar, so I need first case. Then I go to "Creating new calendar" window in thunderbird, enter public access link just to check, and calendar is connected! But it's not all. Then I go back and paste link number 1, also providing credentials info (I have tried a lot of variants, also "test@example.com:password", "test@example.com" and so on) and after pressing "Next" button I get a typical connect error like "Could not find your server, please check entered info".

I have done a lot of tests and checks, and this is a strange details, that I caught and I think it is a Thunderbird bug (I might be not right)... On my nginx reverse proxy I see such log when Thunderbird is trying to connect by my link with RW access: "my-ip-address - - [04/Jun/2025:23:39:51 +0300] "mail.example.com" "PROPFIND /SOGo/dav/test@example.com/Calendar/personal/ HTTP/1.1" 404 146 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Thunderbird/139.0.1" "-"". As you can see, my server returned 404 error.

You can think, that problem is on my side and my server is wrong, but please check next nginx log: "my-ip-address - test@example.com [04/Jun/2025:23:38:43 +0300] "mail.example.com" "PROPFIND /SOGo/dav/test@example.com/Calendar/personal/ HTTP/1.1" 207 125 "-" "curl/7.88.1" "-"". It is succeeded, but this is after my manual curl command like "curl -v -X PROPFIND "https://mail.example.com/SOGo/dav/test@example.com/Calendar/personal/"". You can compare two strings from nginx log that I provided and you will see the only difference is second dash in first log instead string "test@example.com" in second log. That piece of log string contains nginx variable $remote_user, and that means that Thunderbird while trying to connect my server calendar do not provide auth credentials and send request without any user that I enter to corresponding field before connect attempt.

P.S. You can ask me why do I test connection just by PROPFIND request type, because Thunderbird tries some different ways to connect too. And I will ask that: 1) Only one succeeded request, by what Thunderbird connects to my public calendar is with type PROPFIND (as I can see in nginx reverse proxy logs); 2) Other attempting ways to connect falls with same error and also do not contain any user, as I explained before.

Please give me feedback about way how I can fix that and thank you very much for your support!

Problem:

You remove an account like Google from Thunderbird, but Thunderbird continues to repeatedly show a pop-up to log into that account (in my case Google). I've noticed it even freezes the Thunderbird UI on startup.

Note: I'm self-answering this question. Mozilla Support has similar questions, but they're archived with incomplete answers. By archiving them, Mozilla is preventing the community from improving the solutions on those problems.

This exact question has been asked at least 4 different times, and it's been archived with 4 different solutions. All of them are valid advice.

• "Check your calendars" - https://support.mozilla.org/mk/questions/1441082
• "Check your addons" - https://support.mozilla.org/en-US/questions/1208183
• "Check your addressbook" - https://support.mozilla.org/en-US/questions/1440106
• "Check troubleshooting info" - https://support.mozilla.org/en-US/questions/1398233

Running Thunderbird 139.0.1 (64-bit) on new Windows 11 machine. Thunderbird is set as the default email client.

When I click on a mailto: link, it just brings up the Thunderbird application, but does not open a new message box.

My Windows 10 machine running 128.11.0esr (32-bit) handles it just fine. The OS app settings and registry settings look consistent on both machines.

As a test, from the command prompt, I run the command... Windows 11... "C:\Program Files\Mozilla Thunderbird\thunderbird.exe" -compose me@domain.com or Windows 10..."C:\Program Files (x86)\Mozilla Thunderbird\thunderbird.exe" -compose me@domain.com and it clearly shows the -compose argument is not being handled on the Windows 11 machine.

Before I uninstall the 64-bit version, is there something I am missing?

Am I the only one that finds it almost impossible to change fonts. I can change what I type to Large. But that's all. I can't change anything I Cntrl-V into a message. Or inherit text in the process of a reply.

I've recently had reason to try to clean up my email, particularly getting rid of defunct email accounts. However I wanted to save the emails themselves, so was going to move them to an archive under Local Folders.

Unfortunately, I'm finding that a lot of emails from these old accounts (as well as some emails in folders of my still active accounts) cannot be read in Thunderbird. The header information shows up in the view panel (from address, subject, date, etc), but the contents of the email do not display (the preview window is entirely blank), and attempting to copy the email fails.

I've dug into the profile directory and found the underlying Inbox file that stores the email, and all the emails are there. They just can't seem to be read or manipulated by Thunderbird for some reason. Also, if I try to View Source on the email, I just get a blank window.

In most cases, the unreadable emails are from 2012 or earlier, although not all such old emails are unreadable. Some are HTML, some are plain text, and other emails of both HTML and text variety work fine. I haven't found any obvious correlation in the problem.

I'm on 128.11 esr. The accounts used POP, and the emails are stored locally.

Any help on this issue is appreciated.

When I send an image the image appears in my email, naturally. When I get a response to that email, the image is not included. It shows up as follows.

This has changed and I don't know why. Is there a setting or a way to have them included in the return email. Thanks.

I am running TB 128.5.2esr on a new Macbook pro. I've recently been forced off POP into IMAP using OAUTH by google which now requires IMAP only with Google workspace emails. I have a somewhat detailed folder structure for all my incoming mail that benefits from TB filters.

At first I tried reconstructing this folder structure on the IMAP server, but it was a nightmare and did not work correctly.

I have finally found a solution where I filter all incoming email onto a local folder set. However am now finding that the bodies of the filtered emails are coming blank 50% of the time - most likely because the filter is executing faster than the IMAP will load the whole message.

Is there a way to delay the filter execution on the IMAP inbox so that when the filter executes it will copy the message headers AND the body reliably?

In case someone is wondering: this is not a network or connection issue. I am running on hardwired connection on fiber network, and the messages that make it or don't make it are randomly sized (small ones fail while big ones don't and vice versa).

Setting aside the POP vs. IMAP discussions, I will say that I miss POP because it allowed me to "catch" all my email in the gmail server, while using it as I saw fit on my TB/local computer. Now I'm required to mirror both - which is not helpful to me.

Thank you for any help.

I have two computers on which I use Thunderbird. I have never been able to successfully copy my email filters from one machine to the other, no matter what method I employ. It seems that this should be at least part and parcel of copying my profile to the new computer, but I find I have to rewrite the filters yet again. Please assist.

Hello, after googling the topic I only get answers from 2018 or older ... with suggestions that don't work or are not existing anymore. E.g. - type a word > double click it (highlight) > click on 'insert' in toolbar > 'mail to:' ??? there is no such option .. ... why a word? any word?

Any real answers for 2025?

Thanks

neuen Ordner in Thunderbird vom Mailserver übertragen(synchronisieren) funktioniert nicht. Habe auf dem Mailserver einen neuen unterordner im Archivordner angelegt. Dieser wird aber nicht in Thunderbird übertragen

Was having a problem accessing my email with Thunderbird. Posted on forum here looking for help and received a response from Matt, a moderator I believe. His reply pointed me in the right direction and things are working properly again.

I received an email notice informing me of Matt's response, but oddly it did not contain a direct link to take me to that particular thread. It took just a few extra clicks after logging into the site and I was able to read Matt's reply. Am I overlooking something in the email? It's not that a big deal but it seems like most any other site will send a direct link to take you to the most recent response.

When the add-on "Copy Sent to Current" is running, the Composition Toolbar in the Compose Window is blank and therefore there is no "Send" button. What am I missing?

I've attached two screenshots - one with Copy Sent to Current disabled and the other with the add-on enabled.

I recently changed the sorting of my e-mails to be threaded by chain. I like to have all of my most recent e-mails show up at the top, but, within each thread, the most recent e-mail shows at the bottom (see the supposedly-attached image). Is there a way to flip this?

Thank you in advance.

Thunderbird crashed on me last night: "thunderbird killed by SIGSEGV"

The attached image shows that I'm being prompted for an API key. I'm not sure what that is or how to generate one (I presume unique to me?).

I believe I need one in order to file a bug. I can't seem to circumvent it.

Can anyone guide me in the right direction please?

I've imported/exported everything I could from a Win10 to a Win11 one. I then went to the toolbars under "view" and made sure they were all checked. Next, I clicked on "customize" and selected (single click) what I wanted to add to my toolbars in the mail window. The "save option" was greyed out. How do I save these to my toolbars?

The version I was using before could put have a layout like this with a simple tweak below: - Accounts - Individual email pane - Message list

I just CANNOT use Thunderbird if I can't do this. How do I do this in Nebula or what version can I revert to? Go to profile folder: Chrome folder userChrome css file Add this: /* puts message page in the middle */

1. threadPaneBox {-moz-box-direction: reverse !important;}

Hello, I'm trying to setup a new email account using POP3 using the settings recommended by Privateemail and it does not work. Everything is fine if I use IMAP. But I really prefer POP3 I contacted them but can't identify the problem and asked me to revert to you. Can you please help, Thanks beforehand