Forum zhromadźenstwa Thunderbird

After a reboot and Windows 11 update today, Thunderbird (I believe it was v155) will not open. It asks for the password, then sits at [Not Responding].

I have copied my profiles (there are two, one dated 2023 with only a 1K .json file in it, and one created tonight while I was troubleshooting that's several GB and when copying, appears to contain all my mail folders although I can't access them directly from within the profile) to a separate location (my desktop).

I've tried the following (after checking previous questions here in Mozilla support):

(1) booting Windows into safe mode

(2) opening Thunderbird in Troubleshooting mode (Shift while opening), both in Windows safe mode and normal boot

(3) uninstalled Thunderbird from Control Panel, downloaded and installed a new copy of Thunderbird

All give the same result: "not responding", can't click anything. Can only wait or close.

I was able to disable an extension that I installed yesterday that had been working fine.

I'm also wondering if the problem is mail folders that are too large. I have some candidates for deletion but since I can't see any .msf files for them, I can't delete (because I can't open Thunderbird.

I'm leery of instructions to outright delete any Thunderbird folders/files because (1) I can't see my mail folders directly and (2) I'm self-employed and all my client and business emails are in there. Losing them woud be a disaster.

I'm tempted to try the Windows option of restoring my entire computer to an earlier point, say, this morning. But that seems like possible overkill if it's an issue with just Thunderbird.

I'm freaking out, please help!

Since this morning there is no sign of my emails accounts and majority of functions appear disabled, it never happened before. Can somebody explain what happened?

Please check the image attached

Thunderbird is downloading new messages but failing to display them.

Other functionality remains active, ie I can see and open messages, delete all the contents of folders, compose and send messages, but when the software downloads new messages they simply do not display and cannot be accessed.

Not sure if it's relevant, but the message INBOX count appears to be stuck at the number 59, although more messages than that have been downloaded.

Bizarrely this is the message displayed whenever I now open the Thunderbird application (it was there when the problem first appeared and returns everytime). Out of desperation I even made a donation in the hope it would release the messages!

Thank you in advance, Steve Davidson

Aloha. I'm helping a friend with setting up a new Windows 11 PC, and cannot get Thunderbird to connect to Spectrum's servers. I spent an hour on the phone with Spectrum support and they just gave up and said it must be an issue with Thunderbird. Here are the details:

- Brand new Dell 24 All-in-One EC24250 - Windows 11 25H2 plus all additional fixes. - All Dell drivers updated. - Thunderbird V155.0 64-bit

If I click on 'Get Messages' after a while I get: "Connection to server mail.twc.com timed out". I've gone into the config editor and changed mailnews.tcptimeout from 100 to 500 and still get the error.

In the Account Settings | Server Settings | Test server connection I get: An error occurred connecting to mail.twc.com:993.

I've tried this with both setting up a brand new account in Thunderbird, and also via copying the 'Thunderbird' folder from %appdata%\roaming from her old machine.

Email configuration (from Spectrum).

IMAP Settings Server name: mail.twc.com Port: 993 user name: abcd@hawaii.rr.com Connection Security: SSL/TLS Authentication method: Normal password

SMTP settings Server Name: mail.twc.com Port 587 Connection Security: STARTTLS Authentication method: Normal password

Can anyone help me troubleshoot this scenario?

Mahalo, Harry Z

Hello everyone! I also had the error, it randomly started moving messages to folders. I deleted everything, reinstalled (155.0.1), started building message filters. I'm at 29 now. (Gmail account) now I'm not getting new messages. For every filter I get a message saying that the filter could not be applied. No messages are coming, anywhere. What's going on?

when trying to restore/add a gmail account, all my account settings disappeared. Trying again to restore/add a gmail account, an error is showing 'Incoming server already exists' and I cannot connect.

I have a large number of filters, and an important email was processed to move message into a folder. but the filter had no rule that would apply to the message. all the filter criteria were based on the sender, but that email did not have that sender. the filter log shows the filter being applied anyway. I suspect the filter database is corrupted. How can I fix that? i noticed my version is slightly out of date, and I will update it, but I dont expect that would fix a corrupted filter database .

I have been using Thunderbird for over 12 months on my old computer. I have just bought a new computer and I can't install Thunderbird on it. The process recognises my account settings, but when I press CONTINUE it gives me the error message below. The Thunderbird version on my old laptop is 155.0. I imagine that the current version I'm trying to load is a later version.

I’m asking for an update: regarding the total message count, folders with no messages now show a dash, which is really confusing. Could this be fixed so that a dash doesn't appear when there are 0 messages? Before the update, it wasn't like that—it used to show the message count, and there was no dash when there were no messages.

I have been asking for this for at least 20 versions now: the backup and restore function—which is supposed to work when setting up a fresh Windows 11 installation, for example—fails to carry over certain settings. Specifically, things like the "Participants," "Date," and "Name" columns, the sort arrows (up/down), and other menu column settings aren't restored correctly. View settings—such as grouping vs. non-grouping or hidden columns—are also lost; after restoring, you have to manually set up all the columns and date ordering again yourself.

Problem 3

When I type a name into the address book and it appears, I have to click next to the name. However, if I click straight into the text field to start writing and then try to send something, a different contact from the address book might appear instead. This is a bug. For example, I typed in "Mom," but instead of clicking next to the name, I clicked into the text field, and my boss ended up receiving the email—it was embarrassing. Could there be a setting so that when an address book name appears and you jump straight to the text field, that name stays selected instead of switching to a different address book entry?

I am trying to move emails from account "hasche@bigpond.net.au" to account hoedkaas@gmail.com. I was able to do this in a earlier version of Thunderbird. What has changed.

As of noon yesterday my Thunderbird gets messages, puts them in the trash, then the spam and then sends a message to "spam" at my email provider. Since noon yesterday, I don't get email messages. I don't know what else it could be. If I go to the webmail, I get messages, but as soon as I download them with T-bird, they are in the trash and then sent as a spam notification to my email provider. I really use t-bird a lot so I would really hate to stop using it, it's much more useful than the webmail. Thanks

PS. I use Linux Ubuntu

I run Thunderbird on MacOS for some years without a problem. Now, after a hard reboot, Thunderbird won't launch anymore. I tried reinstalling to no avail. Is there anything I could do here? Or do you need any more info? The crash report is as follows:

Translated Report (Full Report Below)

Process: thunderbird [8297] Path: /Applications/Thunderbird.app/Contents/MacOS/thunderbird Identifier: org.mozilla.thunderbird Version: 155.0 (15526.8.28) Code Type: X86-64 (Native) Parent Process: launchd [1] User ID: 501

Date/Time: 2026-09-09 13:49:46.3562 +0200 OS Version: macOS 15.0.1 (24A348) Report Version: 12 Anonymous UUID: A83FED70-635C-4178-5B0E-2FB36A313750

Sleep/Wake UUID: 9CEF8430-EEF8-43BB-AC16-8A9FF7407F51

Time Awake Since Boot: 25000 seconds Time Since Wake: 7284 seconds

System Integrity Protection: enabled

Crashed Thread: 0 MainThread Dispatch queue: com.apple.main-thread

Exception Type: EXC_GUARD (SIGKILL) Exception Codes: GUARD_TYPE_MACH_PORT Exception Codes: 0x0000000000000203, 0x0000000000000000

Termination Reason: Namespace GUARD, Code 2305843146652647939

Thread 0 Crashed:: MainThread Dispatch queue: com.apple.main-thread 0 libsystem_kernel.dylib 0x7ff815680e0e mach_msg2_trap + 10 1 libsystem_kernel.dylib 0x7ff81568f622 mach_msg2_internal + 84 2 libsystem_kernel.dylib 0x7ff815687f16 mach_msg_overwrite + 649 3 libsystem_kernel.dylib 0x7ff8156810ff mach_msg + 19 4 XUL 0x2f9aca7f4 0x2f35dd000 + 105830388 5 XUL 0x2f9ac4183 0x2f35dd000 + 105804163 6 XUL 0x2f9ac2884 0x2f35dd000 + 105797764 7 XUL 0x2f865b45b 0x2f35dd000 + 84403291 8 XUL 0x2f8685615 0x2f35dd000 + 84575765 9 XUL 0x2f868d2af 0x2f35dd000 + 84607663 10 XUL 0x2f868d80f 0x2f35dd000 + 84609039 11 thunderbird 0x10d03ab2a 0x10d03a000 + 2858 12 dyld 0x7ff8153342cd start + 1805

Thread 1:: AsyncSignalControlThread 0 libsystem_kernel.dylib 0x7ff81568187a read + 10 1 XUL 0x2f825612a 0x2f35dd000 + 80187690 2 XUL 0x2f82560dd 0x2f35dd000 + 80187613 3 libsystem_pthread.dylib 0x7ff8156c2253 _pthread_start + 99 4 libsystem_pthread.dylib 0x7ff8156bdbef thread_start + 15

Thread 2:: RegisterFonts 0 CoreFoundation 0x7ff81573a759 CFStringGetCharacters + 98 1 CoreFoundation 0x7ff815803d71 CFURLCreateFilePathURL + 1086 2 libFontRegistry.dylib 0x7ff81e9c2201 TLocalFontRegistryImp::RegisterFont(__CFURL const*, __CFDictionary const*, unsigned int, unsigned int, __CFError**) const + 459 3 libFontRegistry.dylib 0x7ff81e9c2c32 TLocalFontRegistryImp::RegisterFonts(__CFArray const*, __CFDictionary const*, unsigned int, unsigned int, __CFArray const**, __CFArray const**, __CFArray const**) const + 182 4 libFontRegistry.dylib 0x7ff81e9de0ff XTRegisterFonts2 + 701 5 CoreText 0x7ff817d6db29 _CTFontManagerRegisterActionFontsForURLs(__CFArray const*, CTFontManagerScope, bool, Action, __CFArray const**) + 339 6 CoreText 0x7ff817d6eef7 _CTFontManagerRegisterActionFontURLs(__CFArray const*, CTFontManagerScope, bool, Action, URLTrust, __CFArray const*, bool (__CFArray const*, bool) block_pointer) + 42 7 XUL 0x2f4b40609 0x2f35dd000 + 22427145 8 XUL 0x2f4b5deba 0x2f35dd000 + 22548154 9 libnss3.dylib 0x2da8bb369 0x2da709000 + 1778537 10 libsystem_pthread.dylib 0x7ff8156c2253 _pthread_start + 99 11 libsystem_pthread.dylib 0x7ff8156bdbef thread_start + 15

Thread 3: 0 libsystem_pthread.dylib 0x7ff8156bdbcc start_wqthread + 0

Thread 4: 0 libsystem_kernel.dylib 0x7ff815680e0e mach_msg2_trap + 10 1 libsystem_kernel.dylib 0x7ff81568f622 mach_msg2_internal + 84 2 libsystem_kernel.dylib 0x7ff815687f16 mach_msg_overwrite + 649 3 libsystem_kernel.dylib 0x7ff8156810ff mach_msg + 19 4 XUL 0x2f9aca16d 0x2f35dd000 + 105828717 5 XUL 0x2f9acaeac 0x2f35dd000 + 105832108 6 XUL 0x2f9acad91 0x2f35dd000 + 105831825 7 XUL 0x2fb206fa9 0x2f35dd000 + 130195369 8 libsystem_pthread.dylib 0x7ff8156c2253 _pthread_start + 99 9 libsystem_pthread.dylib 0x7ff8156bdbef thread_start + 15

Thread 5: 0 libsystem_pthread.dylib 0x7ff8156bdbcc start_wqthread + 0

Thread 0 crashed with X86 Thread State (64-bit):

 rax: 0x000000001000000a  rbx: 0x00000002db928340  rcx: 0x00007ff7b2ec4af8  rdx: 0x0000003480000013
 rdi: 0x00000002db928340  rsi: 0x0000000400000011  rbp: 0x00007ff7b2ec4b60  rsp: 0x00007ff7b2ec4af8
  r8: 0x0000000000000000   r9: 0x0000000000000001  r10: 0x0000000000002303  r11: 0x0000000000000206
 r12: 0x00000000000007d0  r13: 0x0000000400000011  r14: 0x0000000000000000  r15: 0x0000000000000001
 rip: 0x00007ff815680e0e  rfl: 0x0000000000000206  cr2: 0x0000000000000000
 

Logical CPU: 0 Error Code: 0x0100002f Trap Number: 133

Binary Images:

      0x10d03a000 -        0x10d042fff org.mozilla.thunderbird (155.0) <4c4c4439-5555-3144-a100-2f79b5ba51e1> /Applications/Thunderbird.app/Contents/MacOS/thunderbird
      0x10d168000 -        0x10d1dcfff libmozglue.dylib (*) <4c4c4442-5555-3144-a1b2-7d8d2d6587df> /Applications/Thunderbird.app/Contents/MacOS/libmozglue.dylib
      0x10d077000 -        0x10d083fff com.apple.CoreWiFi (1.0) <c356ba94-c112-3326-9011-74fc0bb4dfde> /System/Library/PrivateFrameworks/CoreWiFi.framework/Versions/A/CoreWiFi
      0x10d444000 -        0x10d5dffff CoreWiFiOld.dylib (*) <d5ce0007-36ac-37a1-a5d7-07ad7365e60a> /System/Library/PrivateFrameworks/CoreWiFi.framework/Versions/A/CoreWiFiOld.dylib
      0x10d056000 -        0x10d057fff com.apple.IO80211 (1.0) <c0791260-3db4-30e8-962c-1d7a90bbe2d5> /System/Library/PrivateFrameworks/IO80211.framework/Versions/A/IO80211
      0x10d061000 -        0x10d061fff com.apple.WiFiPeerToPeer (652.55.0) <6de18c87-b584-3fba-b9f2-5439ee94f3f7> /System/Library/PrivateFrameworks/WiFiPeerToPeer.framework/Versions/A/WiFiPeerToPeer
      0x17689e000 -        0x1768f1fff IO80211Old.dylib (*) <d5ce0007-f5f4-3ab8-a256-05df5202823b> /System/Library/PrivateFrameworks/IO80211.framework/Versions/A/IO80211Old.dylib
      0x1e640b000 -        0x1e6432fff WiFiPeerToPeerOld.dylib (*) <d5ce0007-9684-3a09-bf78-fb3a4f8bb7b1> /System/Library/PrivateFrameworks/WiFiPeerToPeer.framework/Versions/A/WiFiPeerToPeerOld.dylib
      0x2da709000 -        0x2da9d5fff libnss3.dylib (*) <4c4c449b-5555-3144-a1ce-153a9242e9fd> /Applications/Thunderbird.app/Contents/MacOS/libnss3.dylib
      0x2dbc97000 -        0x2dc767fff libgkcodecs.dylib (*) <4c4c4478-5555-3144-a176-a5710479f9c6> /Applications/Thunderbird.app/Contents/MacOS/libgkcodecs.dylib
      0x10d400000 -        0x10d423fff liblgpllibs.dylib (*) <4c4c44b4-5555-3144-a1b9-b5c664969bb6> /Applications/Thunderbird.app/Contents/MacOS/liblgpllibs.dylib
      0x10d06b000 -        0x10d06bfff com.apple.framework.CoreWLAN (16.0) <cf40012c-37ff-356e-863f-24c150978974> /System/Library/Frameworks/CoreWLAN.framework/Versions/A/CoreWLAN
      0x25d475000 -        0x25d4effff CoreWLANOld.dylib (*) <d5ce0007-0117-3ddb-beb8-5886a5f8b758> /System/Library/Frameworks/CoreWLAN.framework/Versions/A/CoreWLANOld.dylib
      0x2f35dd000 -        0x2fe8e2fff XUL (*) <4c4c44ee-5555-3144-a15b-7a3b6ab61736> /Applications/Thunderbird.app/Contents/MacOS/XUL
      0x10d42f000 -        0x10d430fff org.mozilla.channelprefs (1.0) <4c4c4410-5555-3144-a148-95c735c87f29> /Applications/Thunderbird.app/Contents/Frameworks/ChannelPrefs.framework/ChannelPrefs
   0x7ff815680000 -     0x7ff8156bbfff libsystem_kernel.dylib (*) <10094a6c-fa57-367f-b06e-7c449ea31285> /usr/lib/system/libsystem_kernel.dylib
   0x7ff81532e000 -     0x7ff8153ba32f dyld (*) <69c73748-37ae-3a6f-83af-690645c3da75> /usr/lib/dyld
              0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
   0x7ff8156bc000 -     0x7ff8156c7fff libsystem_pthread.dylib (*) <c0db9cf9-86ec-31d4-a557-2c07945fd8f2> /usr/lib/system/libsystem_pthread.dylib
   0x7ff81572b000 -     0x7ff815bcaff2 com.apple.CoreFoundation (6.9) <541c6f06-0abc-39f5-a7d2-3cad5db19c04> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
   0x7ff81e9af000 -     0x7ff81e9faff7 libFontRegistry.dylib (*) <31b7fceb-b146-3e8d-a297-87c67730f388> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib
   0x7ff817c31000 -     0x7ff817e51ff5 com.apple.CoreText (841.0.0.1) <c3eb23cc-fc68-312e-bc9d-8e28a4a44da3> /System/Library/Frameworks/CoreText.framework/Versions/A/CoreText

External Modification Summary:

 Calls made by other processes targeting this process:
   task_for_pid: 0
   thread_create: 0
   thread_set_state: 0
 Calls made by this process:
   task_for_pid: 0
   thread_create: 0
   thread_set_state: 0
 Calls made by all processes on this machine:
   task_for_pid: 0
   thread_create: 0
   thread_set_state: 0

VM Region Summary: ReadOnly portion of Libraries: Total=1.3G resident=0K(0%) swapped_out_or_unallocated=1.3G(100%) Writable regions: Total=7.6G written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=7.6G(100%)

                               VIRTUAL   REGION 

REGION TYPE SIZE COUNT (non-coalesced)

===== ======= =

Activity Tracing 256K 1 Kernel Alloc Once 8K 1 MALLOC 550.1M 21 MALLOC guard page 24K 6 STACK GUARD 56.0M 6 Stack 12.0M 6 VM_ALLOCATE 132.0M 18 VM_ALLOCATE (reserved) 7.1G 10 reserved VM address space (unallocated) __CTF 824 1 __DATA 30.4M 877 __DATA_CONST 95.2M 881 __DATA_DIRTY 2560K 333 __FONT_DATA 2352 1 __INFO_FILTER 8 1 __LINKEDIT 186.2M 17 __OBJC_RO 76.1M 1 __OBJC_RW 2354K 2 __TEXT 1.1G 902 __TPRO_CONST 272K 2 dsce.got 124K 1 dyld private memory 512K 2 mapped file 53.2M 51 owned unmapped memory 20K 1 shared memory 1124K 9

===== ======= =

TOTAL 9.4G 3151 TOTAL, minus reserved VM space 2.3G 3151

Full Report

{"app_name":"thunderbird","timestamp":"2026-09-09 13:49:48.00 +0200","app_version":"155.0","sroute_id":12,"slice_uuid":"4c4c4439-5555-3144-a100-2f79b5ba51e1","build_version":"15526.8.28","platform":1,"bundleID":"org.mozilla.thunderbird","share_with_app_devs":0,"is_first_party":0,"bug_type":"309","os_version":"macOS 15.0.1 (24A348)","roots_installed":0,"name":"thunderbird","incident_id":"D8368554-B699-4AD8-A8A6-2C4175E89A69"} {

 "uptime" : 25000,
 "procRole" : "Background",
 "version" : 2,
 "userID" : 501,
 "deployVersion" : 210,
 "modelCode" : "MacBookPro15,2",
 "coalitionID" : 1356,
 "osVersion" : {
   "train" : "macOS 15.0.1",
   "build" : "24A348",
   "releaseType" : "User"
 },
 "captureTime" : "2026-09-09 13:49:46.3562 +0200",
 "codeSigningMonitor" : 0,
 "incident" : "D8368554-B699-4AD8-A8A6-2C4175E89A69",
 "pid" : 8297,
 "cpuType" : "X86-64",
 "roots_installed" : 0,
 "bug_type" : "309",
 "procLaunch" : "2026-09-09 13:49:45.0052 +0200",
 "procStartAbsTime" : 25995372141555,
 "procExitAbsTime" : 25996722299153,
 "procName" : "thunderbird",
 "procPath" : "\/Applications\/Thunderbird.app\/Contents\/MacOS\/thunderbird",
 "bundleInfo" : {"CFBundleShortVersionString":"155.0","CFBundleVersion":"15526.8.28","CFBundleIdentifier":"org.mozilla.thunderbird"},
 "storeInfo" : {"deviceIdentifierForVendor":"1F778C59-C2BF-597B-B4D7-068A27420DA1","thirdParty":true},
 "parentProc" : "launchd",
 "parentPid" : 1,
 "coalitionName" : "org.mozilla.thunderbird",
 "crashReporterKey" : "A83FED70-635C-4178-5B0E-2FB36A313750",
 "codeSigningID" : "org.mozilla.thunderbird",
 "codeSigningTeamID" : "",
 "codeSigningFlags" : 570490881,
 "codeSigningValidationCategory" : 1,
 "codeSigningTrustLevel" : 4294967295,
 "bootSessionUUID" : "3B94A2DF-4DD0-4B72-9BCF-22A7621B9373",
 "wakeTime" : 7284,
 "sleepWakeUUID" : "9CEF8430-EEF8-43BB-AC16-8A9FF7407F51",
 "sip" : "enabled",
 "sroute_id" : 12,
 "exception" : {"port":515,"signal":"SIGKILL","guardId":0,"codes":"0x0000000000000203, 0x0000000000000000","violations":["ILLEGAL_MOVE"],"message":" ILLEGAL_MOVE on mach port 515 (guarded with 0x0000000000000000)","subtype":"GUARD_TYPE_MACH_PORT","type":"EXC_GUARD","rawCodes":[515,0]},
 "termination" : {"namespace":"GUARD","flags":2,"code":2305843146652647939},
 "extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
 "faultingThread" : 0,
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On 3 August, Thunderbird was automatically updated on my Mac Mini to Version 155.0. Ever since, all incoming mail is placed in a folder called Satellite Radio, and distribution to the proper mailboxes stops.

Starting today (September 3), ALL of my received emails are being put into the Spam folder instead of the Inbox.

FYI, I have been running Thunderbird (TB) for years and have not recently set up any new filters.

I'm currently running Thunderbird 64-bit version 155.0 under Windows 11 Home version 25H2. I am also running Bitdefender Total Security, but I have turned off its Antispam function, both under my usual Standard User account and the Admin account.

I have tried:

1. Going into TB Settings|Privacy & Security|Spam and clicking on "Reset Training Data." 2. After closing TB, I deleted the training.dat file in my TB profile folder and restarted TB. 3. Right-clicked on my Inbox and Spam folders and clicked on "Repair Folder." 4. Exited TB, copied my profile folder to an external HD, uninstalled TB and reinstalled TB after downloading from the official download site. 5. Rebooted my PC.

None of these approaches has worked to solve my problem.

Thanks for any help you can give.

When I open Thunderbird it is sending my emails directly to the deleted folder. I have tried all-sorts and cannot find an answer. I transferred Thunderbird to my new PC and all was working okay for a few weeks then all of a sudden there were emails missing from my inboxes and I found them in the deleted folder. I am 76 years old and need an easy step by step solution please ..... John

Thunderbird not connecting to server. It says timds out and an error occurred connecting to mobile.charter.net. I can neither send or receive emails. This started 8/20/2026

bonjour, J'ai installé un nouveau profil, mais j'arrive pas a utiliser l'icone -sélectionner messages à droite au dessus des mails- appliquer ces paramètres/la vue... Ca me serai utile pour simplifier et unifier mes affichages. Actuellement j'observe aucune changement, bug ou erreur de manip.