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We receive very large text emails from logwatch on one of our servers. Thunderbird becomes unresponsive for several minutes. When it "comes back" other messages can be selected but no content is displayed, and everything is slow to respond. Clicking the X to close the app takes upwards of 30 seconds to actually close the app.

Is there some setting to increase heap / RAM? Or is this a different issue?

Windows: Win11 24H2 Thunderbird: Version 139.0.1

The screenshot shows the reminder window. The window appeared, I enter sleep on the computer, come out of sleep, there is no window. The same thing happens if I close Thunderbird (with a cross in the upper right corner) and then launch it. And the same thing happens after the computer is turned off and on.

What actions have I done to understand the problem: 1) deleted the profile and created a new empty one, i.e. profile files have no effect on this; 2) reinstalled Thunderbird.

The problem started 3-4 days ago. The problem may have occurred after the Thunderbird program update - the update was on June 2.

What is the status of the promised Thunderbird Sync functionality and development? Being able to sync settings, rules, filters across clients would be hugely helpful for me so I am very much anticipating Thunderbird Sync and would like an update since there is no recent information about it online that I could find. Thank you.

I upgraded my Ubuntu 22.04 OS to Ubuntu 24.04, all went well except for Thunderbird which was completely removed! When I try to install it my previous password is refused. I was able to reset it but none of my data (inbox messages, addresses etc ) are there. I also use an extended support version of Ubuntu 16.04 and have Thunderbird still working there perfectly. When I originally installed Ubuntu 22.04 I had no problem with password refusal or all my data not being imported from U16. Can you please advise, Derek

Suddenly today I became unable to send an email from my primary email address which I use on Thunderbird. I receive this error message. Any ideas? I have no idea what the error message is. A screen shot is attached.

I have had Thunderbird set to play a sound file when I get a new mail message. I am currently on v128.11.0esr after being on 115 and earlier. I got the custom sound playing whenever a new incoming message arrived but the last several versions seem to have broken that. Possibly v102 was the last time it worked and has reverted to the default system sound for new mail.

After updating to v128.11.0 I was checking all the settings and noticed that path to the sound file shows '%' in place of any spaces in the folder path. I never paid attention to the % before since it worked on this Windows 10 computer since new in 2021 but stopped working in the last few years. I did notice that Edge opens some .mht files and displays the locally saved web pages with the % without a problem. Actually displays '%20' instead of the spaces. If I do file open from Firefox after navigating to the .mht file it opens in Edge instead of Firefox. Not sure if Edge or Firefox saved the webpage originally but now only Edge will open it.

I did change the folder name replacing the spaces with '_' and now the sound will play but if Windows allows spaces in folder names and paths why should Thunderbird now care?

I'm so sick of getting up to 40 emails a day from the .de domain, a spam/scam out of Germany, on every one of my emails. I have set up filters for "ending in" delete but that doesn't work on incoming emails. HELP!!

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 "[email protected]:password", "[email protected]" 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/[email protected]/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 - [email protected] [04/Jun/2025:23:38:43 +0300] "mail.example.com" "PROPFIND /SOGo/dav/[email protected]/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/[email protected]/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 "[email protected]" 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!

Your updates and those of Windows 11, keep returning my software to each company's default settings. I have Glaucoma. During one of my surgeries, the lens on my eyes were replaced with artificial ones. Now, I have perfect long-distance vision, but I have difficulty seeing anything closer than 24-18 inches. I bought a 17-inch laptop and adjusted all the visual and light settings so that I can see my screen without reading glasses. When I stand and start walking while wearing my reading glasses, I run into things and fall.

Being able to adjust the size of icons, text in toolbars, text on the screen, etc, has made my life easier and allowed me to continue using my computer. Each one of those visual assists, however, requires a different change to default settings in the software. Recently, an update changed the speed of the cursor causing me to hit inaccurate selections. Now, I have to find settings to change that. I am 76 years old, and I have too many new things that I want to learn, to spend hours after an update resetting my personal changes in the default settings.

I am sending this same message to the MS Windows team.

I have an old Thunderbird account that is no longer active but I have a huge archive of emails that I would like to be able to access. Thunderbird takes up a huge amount of space on my nearly full C drive because of this. Is it possible for me to save the archive on my D (data) drive and just have the program on my C drive. And how can I back them up. Thanks!

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.

Amazing that there is no topic for Spam, the most hated aspect of email. Mozilla, wake up!

Anyway, I want to be able to highlight a bunch of spam emails, then block all the domains they are being sent from, first checking to make sure nothing was sent from a legit domain like Gmail or Hotmail. Because the smart spammers acquire domains from which they can generate an untold number of email addresses from and they can just a different one every day so blocking an individual email address from someone like this is useless. They'll never use the same one twice because it's so easy to use another one. They own the domain so they control everything at that domain.

I've never heard of any email program offering this which is perplexing as this is the only logical solution to the vast majority of spam we are plagued with in 2025.

We really need an Add-On for Thunderbird as it appears Thunderbird doesn't seem to care.

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.

Hello - I have 2 Thunderbird accounts supported by gmail. A recent issue has occurred that I cannot seem to resolve. Both accounts are active and accessible on my Android cell phone. Only 1 account is now accessible on my laptop. I have tried all available solutions to get Google to "recognize" this second account but no success. My last email received via laptop Thunderbird was May 1. Any suggestions? Thanks very much, Jim