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We are facing issues with Thunderbird mail application.

Incoming emails are not being received in Thunderbird. Thunderbird is running very slowly and frequently becomes unresponsive. Sending and receiving emails is taking a long time. We have already restarted the application and system, but the issue still persists.

Kindly check the mail server settings and Thunderbird configuration from your end and advise on the necessary action to resolve this issue as soon as possible.

Your prompt support will be highly appreciated.

I don't know where to start. Ever since the update to version 154 I've been having one problem after another: switch from Comcast to Yahoo causes problems with THunderbird, slow indexing, arbitrary folders showing up in different email addresses (confuses my account with my wife's' some of that may be problems dealing with gmail issues), lost email folders after attempted repairs. Three months ago there were none of these problems. I have not yet tried switching back to the last updated version of 153, but 154 does seem to have many more problems. I've run troubleshooting.

I am not a computer expert and there is only so much time I can devote to this, but even computer repair services I've called are at a loss and very pessimistic about the ability to repair things. In all the years (over a decade) my wife and I have used Thunderbird, there have never been as many problems as have surfaced in the last two months. Maybe the best that can be done is to hope that updated versions will gradually fix these issues. I will say that my Macbook Air (M2 chip) has far more problems than my iMac (M1 chip). I have checked and rechecked all server settings (smtp and imap). Although more cumbersome, things perhaps work better if I just stick to webmail options.

All of a sudden I have to open the program twice for it to run. First time the screen opens but it is just blank and says it is not responding. So I close it and then open it again and it is fine. Anyone know why this is happening?

When searching for "woolworth sarina". the browser does crash. Same thing happened yesterday when serching for "corona specials mackay"

What is the issue? This never happened before. I reinstalled Firefox Focus and did get the same result.

Hi,

I'm running the latest version of Thunderbird 140.12.1esr on 15.7.7 (24G720) on an M1 processor.

I'm witnessing Memory leak > Thunderbird who usually use 800MB jumps to Gb up to 60Gb

It makes this version unusable.

Here is a loom of the incident: https://www.loom.com/share/0b8e661b42d64d749d80adfd71fd1e04

+ a screenshot

Anyone can help ?

Best Olivier

If Thunderbird startup is stopped before tabs are loaded, they are lost. The tab fields at the top of the screen remain but they are empty. Evidently, tabs are stored only in a temporary location. This is a very annoying bug. Is there a way to recover them?

I AM RUNNING WINDOWS 10 ON THIS COMPUTER AND I FIND YOUR UP DATES EITHER STOP FIREFOX FROM WORKING OR LOADING PAGES AND I AM TIRED OF THIS...

FIX YOUR BROWSER SO I CAN USE IT OF I WILL FIND ONE THAT WORKS. I AM SITTING HERE WATCHING WHAT USED TO BE AOL'S OLD LOGO MOTION...

''''PLEASE FIX IT OR LET ME KNOW OF A BROWSER THAT WORKS OR I WILL FIND IT MYSELF''''.

When seaching the browser will show the result for a split second and then crash. This is a private browser and can not be reloaded. Sending an error report to Mozilla.

I download my e-mail from Yahoo using POP3 and OAuth authentication. Downloading works fine until I reach a particular e-mail. Thunderbird says "Downloading message 27 of 52" (or whatever) and then it will stall and eventually timeout. When I go into Yahoo webmail and archive the next message out of the inbox, the rest of the e-mails download.

I know exactly which e-mails can't be downloaded. They are from my Moen Flo account (a device that monitors water use at my house). It is not spam, and it is vital that I receive these e-mails. So identifying the problem e-mails and deleting them via Webmail will allow Thunderbird to download the rest of my e-mail, but it doesn't solve the problem. I saw someone else on the forum had the same problem with USPS tracking e-mails. There are probably more legit e-mails that cause Thunderbird to choke.

Having to go in to webmail every day and delete every legit e-mail that causes the downloading to fail is not a solution. If the e-mail client doesn't work unless you go into webmail first, then what's the point?

Not an ISP problem - I can download with another e-mail client through the same network.

Not an antivirus/firewall problem - I tried it even after uninstalling antivirus and turning off Windows Defender.

This is definitely a Thunderbird problem. I am 30-year IT professional and I have tried everything to narrow it down to this.

So how can we get the developers to look at whatever combination of characters is causing Thunderbird to choke when attempting to download e-mail? I have sample e-mails that reliably cause the problem.

Thank you.

When I went to open Thunderbird this morning it told me the programme was already running. It certainly was. There were an infinite number of Thunderbirds running! After failing to close them all, I closed down the computer and started it again. Thunderbird was veryslow to load and when it did, the display for my inbox was of emails from four years ago. I strted to scroll down using the mouse but then I noticed it was scrolling by itself. Eventually it reached today and had downloaded some messages.

The system is though running very slowly, it takes a while for a message to open and messages which I have left open at the top of the screen for action are not showing subject or content. I operate a complicated system of filing in subfolders of messages I need to keep for reference and the subfolders seem to be ok.

I started using Thunderbird many years ago when a IT friend recommended it because, unlike Outlook, Thunderbird has an infinite capacity. I am wondering however if I have taken that too literally? I must have thousands of emails in my IN box going back years, plus a structure of some subfolders which are never used. Is that likely to be why I am having problems and would I be well advised to do a bit of a mega clear out? Advice please from the more tehnically skilled would be much appreciated! Carol

I see others are having this same issue with no resolution in sight.

The company I work at is unable to print anything through the print preview in Thunderbird. The current work around is to download, open, then print the file.

Does anyone have any further information on this subject besides going through separate avenues to fix the problem?

Thanks!

Hi everyone, I’ve been using Thunderbird on Android for emails, and I’ve noticed that notifications sometimes get delayed when I’m gaming on my phone. During longer gaming sessions, emails don’t show up right away and only appear after I exit the game or switch apps.

I’m guessing it might be related to background app restrictions or battery optimization, but I’m not completely sure. I’ve also noticed something similar while playing heavier or modded versions of Stick War: Legacy (https://stickwarmods.com/), where the game tends to keep the phone more “locked into performance mode,” and background apps (like email clients) seem to get deprioritized. In those cases, notifications also feel delayed until I minimize or close the game, which makes me think it’s more about Android’s background process management during sustained gaming sessions rather than the email app itself.

Has anyone else experienced delayed notifications with Thunderbird Android while gaming? Any tips on keeping notifications timely without affecting game performance would be really helpful.

This post is more for posterity than asking for a solution because all similar topics ended up being Avast antivirus interfering or something less nefarious.

In my case eM client started having this problem first, then I switched to TB, but the same issue here. Of all places, the best clue was found on [[Linux mint|https://forums.linuxmint.com/viewtopic.php?t=213352]] forums. It was a permission problem. Right click on C:\Program Files\Mozilla Thunderbird -> properties -> security. I did two things and not sure which one did it, but they pretty much achieve the same. ...

The Users group in the list only had read permissions so I gave it full access to the folder and checked the option to set the same permission changes to all subfolders. I also added my own personal user to that list and gave that full permissions. Oh yeah, also changed owner to myself from whatever default windows group was there before.

Now, do I know the full repercussions of doing this? No. Pretty sure this just created a security hole inside my C drive, but... I don't really care at this point. If I had to fix this again, a solution might be to instruct TB to store the the email files somewhere else rather than where it is installed itself (somewhere less locked down than Program Files).

Hello, we have the issue, that Firefox esr 153.1.0 crashes on opening urls. The crashes happen on several devices. These are the current crash-reports: bp-3e6bd41b-89b0-4a49-9479-90cbc0260831 bp-9bd858e0-2573-4a01-8bac-90c320260831 bp-ad358921-a24d-4e02-9ed5-2bc4d0260831 bp-0bfb15d0-b637-48b6-a445-94b350260831 bp-0dc0dbcb-fb77-4ce6-a1c0-659f40260831 bp-268bf05a-3eb7-493e-bd40-42e0c0260831 bp-3910ddb1-9dbd-4016-b421-0dd450260831

thanks for Help and advice.

Best Regards

Felix

Firefox was running very slowly on my computer. Web pages take a long time to load and sometimes Firefox becomes unresponsive. I have restarted Firefox, but the problem is still happening. Please help me fix this issue.

Hi, I've been back to Thunderbird since May, and while I'm happy to be moving away from gmail.com I find the experience with thunderbird a little disjointed and frustrating.

And it would be fine if it was not also sluggish.

I have approx 100'000 emails in All mail, 15'000 mail in inbox,203 mail folders and 160 email rules each with about 3 sub-rules each.

When I get a 2 Factor message sometimes it only take 10 seconds, sometimes it takes minutes, sometimes it never appears until I press the "check mail" button, it's never clear what "check mail" even is doing, if anything at all.

My computer is a 16 core Ryzen 5950x with 64gb ddr4 and it is otherwise very fast and I don't have any crapware installed like "mcaffee anti virus" or whatever.

I can't tell but it feels like it is applying every rule to every email in "All Mail" every single time and I'm pretty sure that is why it is so slow.

However the interface is very obtuse about what it is doing, so I have a hard time finding what the problem is.

Now, I am not going to delete my messages and I am not going to have fewer rules. but I think the rules should only be applies to newly received messages and that should only take milliseconds. Also, it should be easy to tell, what it is doing and how much time that takes ?

This indicator, is mostly meaningless

And this window, really doesn't say that much about what it is scanning

If it were saying how many email and which folders it applied rules to

It would feel a lot less sluggish if I was able to see what it is doing and be to tell if it is doing something or just hanging, it is very frustrating to wait and not even be sure if anything is happening at all !

And I greatly suspect that my problem is that it is applying All rules to All mail, not just the new mail, and if that was fixed and the activity manager made more descriptive and responsive, it would not feel so slow and frustrating and I would know what to change to make it faster !

But right now, if I didn't have such distaste for google, I would just go back to gmail which never made me wait more than 2 seconds for anything.