Thunderbird Community Forum

I have been using thunderbird for a few years now on win 10. Just had to buy a new win 11 system and successfully installed it. transferred my emails, folders and contacts and all seemed to work fine. Now I notice that once I leave it for a few mins, it is unresponsive with just a blue circle where the curser should be. I close it and re open and all is fine again for a few mins. I have tried turning off my antivirus software and disconnecting from the internet but still the same fault. Any ideas please?

Imagine having more than 30 Accounts to be added on a single profile my concern is how will Thunderbird handles file size if it's using one file (MBOX) and if the file has no solution, can I create files and keep mails on them until they reach max size?

My green "New Message" button has stopped working for some reason. I've tried switching it off then back on but it still won't work. so at the moment I can't create new emails. Regards William

Moved to New Question related to 'Sent' file size: https://support.mozilla.org/en-US/questions/1485833

OK, I noticed my Sent mail folder has a file size of > 3 GB (3,224,360,399 bytes) Probably why it is not being read How can I reduce the size of this file (without being able to open it in Thunderbird)?

I've been using Thunderbird for probably 10 years or more. My current version is 140.1.0esr (32-bit) - unsure when this was updated from previous version. My pc is a 64-bit pc so I'm unsure why I'm running the 32 bit version of Thunderbird.

Starting today, when I click on the New Message button, nothing happens except the button seems to register the mouse click with a slight change in appearance. Usually this would open up a blank email but I currently can't write a new email until this is resolved.

Turning off Anti-virus makes no difference. I've tried a PC restart also with no effect.

Any ideas what I can try please?

I was running TB 128.11.1esr up until 10:00 this morning on Windows 10 Professional 22H2 64-bit. I have some e-mail messages that I cannot delete. This morning I auto-upgraded to 1o 128.12.0esr and then to 140.0esr. I still cannot delete the messages When I try to delete a group of messages (containing the message in question), the messages in the in-box turn from black to gray, and I see at the bottom "Moving messages to Trash". But nothing happens. I did a "Compact folders", and it completed without any error messages. I can look at my Trash folder, and the contents seem to be intact. In one case, I individually deleted all of the messages except one. With this one, I open the message and see nothing in the bottom message content pane. When I do a "cntl-u" to see the RFC 5322 message headers, I see a window that is completely blank. What is happening, and how can I debug this? Thanks.

Since a month or so, I am experiencing a rather long delay before seeing content of the email body area. I can see the content of the Subject line, but text in the body area is slow to show up.

Thunderbird performs a compaction. When it is finished the blue progress line is still showing on the bottom right hand side of the window.

You can select any folder and any view condition (read, all, tags etc) and no emails are shown anywhere.

• Restarting Thunderbird fixes the problem with no errors.
• This has happened a lot of times now and is consistent.
• If you force a compaction the problem does not occur.

Update: Usually, in frustration, I restart Thunderbird to fix the problem. This time, whilst typing this forum question, the problem resolved itself. I guess about ten minutes elapsed before the application righted itself. I will watch for the next incident and see what other information can be observed.

While checking mail in my inbox, I opened, then deleted a message (message 1). As has been happening lately, there was a significant pause between my hitting delete and the mesage going away. Then I opened another message (message 2), and I found that it had the header for message 2 displayed in the inbox, but showed the text of message 1 when opened. Scrambled messages and headers could be a big problem.

I logged onto the mail server (gmail) directly. It showed me message 2 with the correct header, and message 1 was in trash.

To fix the problem, I deleted message 2 on the server, and waited for it to vanish from the headers in my Thunderbird inbox. Then, I copied it back from trash on the server. After it downloaded to Thunderbird, everything was fine, but I wanted to alert you to the issue. Something evidently can go awry on TB's end to scramble headers and messages, and that is scary.

Running TB 147.0.1 with gmail(imap) as the mail server. I have posted twice in the past week about issues with gmail, and I am suspecting something going on at that end. My TB installation is brand new since then; the problems with logging on and staying connected that I reported only went away when I removed .esr, rebooted, and did a clean install of TB.

Please advise if this is a known problem, and if there are settings I can tweak to prevent recurrence.

Inbox displays nothing except a few emails from years ago. Troubleshooting mode shows a correct inbox. Returning from troubleshooting mode reverts to the incorrect inbox. Selecting Reset Controls while in troubleshooting mode corrected the issue.

When i minimize, it starts "eating" ram the computer crashed when it consumed 59GB of ram.. suspect memory leak.. One solution is turning it off after checked for mail...But i kinda want it minimized so i don't have to check by starting it every now and then..

I can't add any email accounts in ThunderBird. The window keeps loading. Trying to uninstall and reinstall didn't help. It doesn't work on other devices either.

I tried to install the mailbox on another computer and the email configurator opened—I managed to add one account in this window, but when I tried to add another one, it didn't work like it does on other devices.

Downloading the latest version 143.0.

I'm not asking a question now; I already found the answer. I'm contributing an answer in case others run into the same problem I did. The archive function in Thunderbird was running painfully slowly. I remembered it as being fast, moving from local folders (from POP) to local archive folders quickly, but lately it had been slow, like seconds per message. And I had thousands of messages to deal with. This is on Windows 10 Pro.

The fix turns out to be in Settings -> Windows Security -> Virus and Threat Protections. It has an option "Cloud-delivered protection", which "Works best with automatic sample submission turned on". Now frankly that sounds like a major-league security hole to me, sending old private messages to Microsoft! Turning them both off fixed the problem. Now archive is entirely local and isn't held up by Windows mucking into the system and trying to make copies of private mail and send them to the mothership before moving them. I don't know how Windows "Threat protection" broke into the internal operation of T'bird but that was an easy fix once I found it, and the archive function is very fast, even moving thousands of messages at a time.

Downloading emails works quickly as normal but reading opening or looking at emails (even ones downloaded weeks ago) is suddenly very slow. There is a pause before anything can be viewed even with a preview screen open.

Version is 128.7 0esr I use bitdefender - but that has never been a problem before Any ideas?

I noticed this morning that my Thunderbird tree no longer had a Junk folder. I restarted the program and Junk appeared, with stuff in it, but right-clicking the Junk folder no longer brings up the usual list of options, including Empty Junk. Instead, right-clicking seems to temporarily slow-down or 'hang' Thunderbird, a condition it does recover from in 10 seconds or so. I can open the Junk folder, select all messages and delete them, but something isn't right. Any ideas, anyone?

Update: Realized I didn't mention the version I was running, it was 133.0.3, under Windows 10, but when I opened Help to find this I was invited to do an update... so I did. When the 'update' was complete, I checked and am now running 128.6.0esr (64-bit). That seems strange. Oh, the same Junk problem persists under the 'new' version.

Update #2: Evidently the drop-down menu does eventually appear, if you just wait for it... anywhere from 5 seconds to 30 seconds or so. Normally the right-click is instantaneous. What could have happened, I wonder?

Thunderbird just updated to 144.0.1 (64-bit), and now I see a blank area where message list used to be. This true for all accounts and all folders.

I used to see this issue temporarily after compacting folders, but usually (but not always) went away and messages showed up. Sometimes I had to close and restart TB. Now even that wont bring up the lists. I'm dead in the water. And, yes, I did reboot my computer as well. Screenshot of this state attached.

Thanks for any help--it's urgent. Bert

Thunderbird 140.7.0esr (aarch64) on macOS26.02

For several days now, Thunderbird has been responding extremely slowly to mouse movements or clicks. This leads to undesirable results because emails are suddenly deleted that should not be deleted (due to forced double clicks). Or folders are not opened, or the wrong folders are opened.

The last change was updating Thunderbird. Is this a known bug?

This is an odd one I've not encountered before. I have TB installed on 2 laptops at home. They are up-to-date with 128.6.0 installed, and both are using the same wi-fi system.

All of a sudden a few days ago, TB on one of the laptops, but not the other, became noticeably slow in deleting messages. It now takes a few seconds for what before always happened instantly (and still does on the other laptop).

Not the end of the world but it's annoying and I'm hoping there's an easy fix.

Thanks for any help.

Andrew

I have just upgraded to Thunderbird 102.15.1 on my laptop and have a problem with right-click menus on folder names.

The menu appears for a brief instant and then disappears. If I move the mouse cursor slightly then it is redrawn and behaves normally.

Is this a known problem, i.e. requiring a further upgrade?

Hi

Long-term Thunderbird user and in the past couple of months Thunderbird on my PC on connecting to my mail server goes to a time out (about a minute?) before then downloading new messages. Connecting from my laptop is instant.

The PC - which is relatively new - performs well otherwise.

Checked settings on both and they are identical, save for the laptop.being 64-bit and the PC 32-bit versions.

Any ideas for me to try?

Many thanks

Rick