Thunderbird Community Forum

I was happily using TB 78.14.0 on Mac OS 10.9.5 and I switched to using TB 140.6 on Mac OS 12.7.4, and it's now unusably slow. I've tried: troubleshoot mode with add-ons off; compacting folders; removing and renewing msf files; emptying junk and trash. Is there anything else, or is this just a failure or incompatibility of the app? I can't see that there's any antivirus app that might be interfering. Can something go wrong when you export the files from one TB into another? I would be grateful for any suggestions. Tim

I've always experience occasional TB crashes. According to my log history there was 1 in July, 3 in Aug, 2 in Sep, 2 in Oct, and 6 in Nov. I never really paid attention since the reboot was quick. But now in December I am losing work and it is a major problem. I've had 30 crashes in Dec and 21 in the past week. I have only 3 add ons and they have not changed, and a Copernic connector. I disable the Copernic connector and it didn't help. I have the same 140.6 on my Surface Go with the same add ons, except for Copernic and it runs fine. On both PCs I use Malewarebytes and WinDef. I have put exclusions for them in their setups. Even with MBAM completely disabled I've still had crashes.

I cleared the Cache and no help. I've even had occasional crashes in Troubleshooting mode. Here are my last 5 crash IDs

bp-070bf941-4e8b-41a3-8b84-3e3440251224 bp-a936f7c2-9ee3-4c38-b304-dab830251224 bp-8be9cf9e-8f2f-49bb-95cf-47e780251224 bp-12f8fc2c-c505-40f0-8c67-44b730251224 bp-9013fb78-086c-4327-9de8-62db30251223

Interestingly I’m also experiencing crashes with Firefox, especially ChatGPT. I cleared the ChatGPT history and that helped but did not solve the problem. I cleared the Firefox cache and in troubleshoot mode still have issues.

Otherwise my win11 PC seems to be working fine. I’ve run chkdsk and all is ok. Also scannow is ok.

Is my next step a profile rebuild?

Starting in mid November 2025, my subfolder - named Apps, disappeared from my folder structure. I've used this for many years without an incident. It remains on my structure when I open my email via a web browser, but is absent from Thunderbird.

What changed? Is there something now forbidden about the name?

As I have message filters created to sort all my emails, it is a real problem now with Thunderbird. I would be grateful if someone can enlighten me on how to solve this issue. Jerry

Hi, I am transitioning from Mac, after 30+ years, to Linux. Part of this is making sure that certain heavily used applications can be relied-upon in Linux. A couple days ago I successfully installed Thunderbird and moved my Profiles into the Linux version of Thunderbird. (This really needs better guidance from Mozilla! What I found on the subject was definitely NOT accurate!! Instructions should NOT be identical for all platforms). In a cautious abundance of excess, I repeated the same transfer onto a second Linux machine. Now I have Thunderbird running on my desktop Mac Mini AND on two separate Linux machines. Eventually, it will be removed from the Mac. What I never expected was that every time I received, deleted, read, etc., email, the same action would occur on the other two machines, regardless of on which machine I made changes. All accounts are set up as POP accounts, BTW. How is this possible? are the three instances of Thunderbird aware of each other on my local network? Or, is there some sort of updating processing happening from my ISP? Regardless, I am thrilled that I can potentially use Thunderbird simultaneously on different machines, but... Down Side: Apparently, not everything is mirrored. I just moved a newly received email from the inbox to a local folder inside Thunderbird. That action was NOT copied on the other two machines. Is there anything I can do to keep ALL the folders in sync? Thanks very much.

I need my Password I tried all 3 of them. Could you please send me my current password or tell me how to reset it. Thank you in advance Greg grgory999@roadrunner.com

Hi. I access a gmail account via Thunderbird. It's generally quite efficient, but recently it has become very sluggish. I have pretty fast internet, wired at 1G, so usually my mail appears almost immediately. In the last week or so it has slowed down dramatically, sometimes requiring multiple login attempts. Any idea what's going on? Thanks. Steve

I have 21 filters set up in Thunderbird (originally on the Mac, now on Windows). This is for an IMAP account.

Most of the filters are simple, one match, mark message as read, move to a folder. A few have multiple matches, but the same mark read and move to folder steps.

Some filters work fine, some do not work at all. The ones that are not working are the simple single match ones. There's nothing in the filter log showing what the issue might be. The filter in question doesn't show up.

What can I do to track down what the issue might be?

Thanks.

Trying to set up multiple email accounts. The first one worked.

I got configuration errors and I disabled the server hub per a community suggestion. When I try to add a second account (IMAP) now, it says that the server is in the database. When I hit 'done' however, I get this error: "Unable to log in at server. Probably wrong configuration, username, or password." This is happening for multiple accounts - always the same message. I can manually log into these accounts with a browser using the exact same info. Yes, I have checked the server info. It matches.

Having been using Thunderbird for over 25 years, I have some folders with very old mail which I am unlikely to ever want to access, but don't want to throw away. And, I am in a space crunch. Would it be reasonable to zip the contents of appropriate mail folders, store those elsewhere, then clear out the folder. Then, I could unzip to restore if needed.

Ideas?

When I let thunderbird compress the inbox and other folders, the not read flags on all new emails get reset as if I have read all of the new emails. Compressing the inbox and other folders should have no effect on the flags showing a message has not yet been read. That only makes sense. The not read flags getting reset started happening several versions before 145.

Sending of password for user lehmannc@hispeed.ch did not succeed. Mail server pop.hispeed.ch responded: [AUTH] Authentication failed.

Bonjour,

J'envoie, depuis une mailing liste d'OVH, un mail présentant l'aspect suivant : une image encadrée (cf: PJ) Lorsque je le réceptionne avec Thunderbird, seule l'image apparait (cf: PJ)

Le code source de cette dernière montre que le code html du cadrage est présent. Un réglage bloque la lecture de l'html ?

Que se passe-t-il ? Merci de votre aide.

PC: Intel CPU OS: Windows 11 DNS: Google

Thunderbird repeatedly crashes and locks up the task bar. The now frozen PC has to be rebooted by manually powering down the machine. I am in the release channel and using the latest version.

Win 11 and Thunderbird 140 not working and I have tried all the things I found on the internet and none of them work. I have tried cleaning my registry and deleted directories and uninstalled thunderbird re-started and it will still not work.

I guess I have to forget thunderbird. It is a shame.

This has happened to me twice now. I do not delete emails from purchases until the item is received. I leave it in my inbox and often will mark it unread. I went into it yesterday to check to see when I should receive a certain item and the email is gone. I have looked in all folders (spam, trash, archive, all mail) and it is not there. I blamed G-mail originally but now wonder if it is Thunderbird and if there is some way to retrieve it. Is there a defunct setting somewhere that I do not know about or understand? I have plenty of storage. Can someone answer this for me?