Komunitné fórum Thunderbird

I have a window home computer that was upgraded from w10 to w11. I had to buy a new w11 machine at my vacation home because the old one was not upgradeable. I was successful in moving the profile from home to vacation home. But a month later I corrupted w11 on my new vacation machine while loading my earlier version of Adobe Photoshop from their instilling disk. W11 could not be repaired and I had to reinstall new w11 while keeping my files etc. This time Thunderbird would not let me move/use my old profile file. No mater what I tried!!

In the past, I've always moved the profile file "Thunderbird" in Appdata file to the new machine and renaming the installed Thunderbird file with XXX after it. It always worked in the past. My profile file is over 2mb. I've tried using all of the logical import options in this new instillations and only get error messages that it could not import the data and to look at the error console? Which I don't know where that is located. I will look for it in w11.

I think that the only difference (which I don't think should make a difference) is the directory name file difference after "users"

Any help would be much appreciated!!!!!!!

Jim Flora (Long time Thunderbird user and supporter)

For some reason, Thunderbird is prematurely word wrapping (or inserting line breaks) on emails that are sent.

I'm using default 'HTML Style' Defaults, but have also messed around with those to see if I can fix the issue - to no avail.

I found an old 'question' on the support site where this seemed to have been resolved (https://support.mozilla.org/en-US/questions/1307490). Unfortunately, the Solution doesn't appear to apply to modern Thunderbird versions (e.g., version 148); I can't find the suggested setting to change.

I deleted my Thunderbird account and created a new one on the same computer. I used a Profile saved on my external hard drive. The address book info was replicated. The hierarchy of folders and their emails were not replicated in the left hand pane. Is there a way to retrieve those folders with their content? Please, I am not super techno-savvy, so take me step by step. Thank you.

Help please I want to use "Personal Backup" program to save a backup of data needed to restore thenderbird Using tools>help>trouble shooting>application basics>profile>open folder gives 5 files all ending in .default 3 are 1 KB - can these be deleted? 2 have more folders each with many folders and files- are they both needed? which do I use for backing up with "Personal backup" program? the "Personal Backup" program finds 2 possble profiles defaultuser and default_user, which do I need? I am on the "release update channel"

Von der Erstinstallation war ich gewohnt, dass von oben nach unten die Darstellung der Ordner wie folgt war: Posteingang / Entwurf / Gesendet / Archiv / Spam / Papierkorb / Local Folders /Postausgang / Unbekannt Nach der neuen Installation, die erforderlich war (Rechnerneuinstallation) ergab sich folgendes Bild von oben... Lokale Ordner / Papierkorb / Local Folders und dann alle meine selbst erstellten Ordner am Ende dieser Aufstellung kam die Zeile mit meiner web-Adresse xxxx.xx@web.de dann Posteingang usw. siehe oben aufgeführt Damit liegt der Posteingang am Ende meiner Ordner Auflistung und das ist über den unteren Monitorausschnitt hinaus, diese Situation ist für mich untragbar und deshalb werde ich wohl auf ein anderes e-mail Verwaltungsmedium umsteigen müssen. Eine Kopiermöglichkeit um die Ersteinstellung zu erreichen war kläglich gescheitert und jetzt ist das Durcheinander noch größer beste Grüße B. Bein

I am unable to send emails (but can receive). When I try to send an email with an attachment, I get the pop up that states "Login to server smtp.(companyemail).com with username icclabcalibrations@(companyemail).com failed". Once I hit "retry" twice, another message pops up that says "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.(companyemail).com timed out. Try again." Once I try again, a third message pops up saying "Sending of the message failed. An error occurred while sending mail. The mail server responded: ...authentication rejected. Please verify that your email address is correct". I have made sure to check that the connection security settings are correct as well as the outgoing server settings. I have also edited my email and replaced it with "(companyemail)" for privacy reasons.

I like very much Thunderbird very much, but I had to move recently to use an Android device, that is my main computer now. I normally work with four email accounts, and I sometimes need to move emails across different accounts. I found out that it is not working on the mobile app. Are there any plans to include this functionality in Thunderbird? Thank you very much.

I made a folder and called it April. One day the folder just disappeared. No one seems to help me recover the folder and i need it. Once I moved emails into that folder they are no longer available in my inbox. SO if you know how to recover my folder help, or if you know how to recover emails that were sent to a folder, that would work also. I use Windows 11 and I have the most recent release of Thunderbird. I use Charter.net as my isp which is pop. Thanks,Charles

I cannot send from an Office365 account but can get mail - it simply says 'sending' but nothing happens.

I am using Owl (paid subscription) for my Office365 account.

I also have another email that is a simple IMAP account and that works beautifully!

I have a few folders I need deleting.

They do not appear in my webmail (mailserver) but do in Thunderbird - I have tried so many methods on your forums, but nothing is working - can you help?

Hi all — I’m running into a persistent threading issue in Thunderbird (v.148) vthat survives profile rebuilds and affects only specific conversations.

Symptoms Some threads show the expand/collapse carrot normally.

Other threads (same accounts, same folders, same time period) do not show the carrot.

The pattern is consistent: the same conversations fail before and after a full profile rebuild.

Both Inbox and Sent show a mix of threaded and unthreaded conversations.

No global setting seems to be wrong, because most threads work correctly.

What I’ve already checked mail.strict_threading = false

mail.thread_without_re = true

View → Sort By → Threaded

View → Threads → All

Folder Repair on Inbox and Sent

Full profile rebuild

Re‑added all accounts

Rebuilt .msf files

Verified that threading works across folders (Inbox ↔ Sent)

Verified that threading works across accounts

Verified that threading works for most conversations

Header checks For the conversations that do thread, headers look normal.

For the conversations that don’t thread, the headers also appear normal:

Message-ID: present

In-Reply-To: present

References: present

No obvious corruption, malformed IDs, or missing brackets.

What I’m trying to understand Why would Thunderbird:

Successfully thread most conversations

Fail to thread specific conversations

Preserve the same failures before and after a rebuild

Show carrots in Inbox but not in Sent for the same conversation

Show no global misconfiguration

Is there a known edge case where Thunderbird rejects a thread even when the headers appear correct?

Are there hidden rules about ambiguous References: chains, multi‑server storage, or cross‑account BCC workflows that could cause this?

Any insight into how Thunderbird decides not to show a carrot would be appreciated.

Thanks in advance.

Since the firefox upgrade of March 4, 2026, I have lost all of my old emails in my inbox. These are important items I need to work on before I complete and file away. I need to gain access to them ASAP. Thank you.

Menu: Message>attachment>delete all

When delete all attachments for a message, when delete all attachments, auto move to the next message.

This behavior is annoying, usually I first delete all attachments and then reply but message position is in the next message.

This behavior is for example for version 140.7.1esr and 140.8.1esr.

102.15.1 work fine.

bold text Hi, I have Yahoo mail and Thunderbird. I want to use TB as my main mail but still keep my Yahoo account as the data is stored by yahoo and I suspect I will loose my history if I cancel..

I leave my email and a couple of other tabs open when I shut down. I cannot make TB appear as a tab, it always opens full page.

Any ideas?

I have some more email accounts with Hotmail and Outlook but there is popping an error just after the popup where it asks for permissions to connect Thunderbird to my account, and I say Yes and also receive the email that some new apps have connected to my accounts, but Thunderbird just at that step instead of Finish it displays that error message like asking again for Username and Password and even if I fill there the correct details it doesn't go further. Something is unclear at that step, because I also tried removing the passkey from the respective account Page at outlook.com and also the 2FA but the same.

Can you help me?

Thanks

In our organization we have moved from an on-premise mail server to M365. We've also added our new EWS-based accounts to Thunderbird. Since there are a large number of users with a significant amount of older mails they want to have access to, they have been asking how they could upload them to EWS now.

We've noticed that either copying or moving messages from local folders to an EWS folder fails after some time. Has anyone encountered this?

From the TB diagnostics console:

08:32:44.651 Warning: Invalid absolute docBaseUrl: "x-moz-ews://outlook.office365.com/%CE%95%CE%B9%CF%83%CE%B5%CF%81%CF%87%CF%8C%CE%BC%CE%B5%CE%BD%CE%B1/6163?part=1.2&filename=%CE%94%CE%95%CE%9B%CE%A4%CE%99%CE%9F%20%CE%97%CE%9C%CE%95%CE%A1%CE%97%CE%A3%CE%99%CE%91%CE%A3%20%CE%91%CE%A0%CE%91%CE%A3%CE%A7%CE%9F%CE%9B%CE%97%CE%A3%CE%97%CE%A3%2004-%CE%9C%CE%91%CE%A1-2026.pdf&type=application/pdf". 2 pdf.worker.mjs:357:13 08:32:44.663 PDF 5df956e1527bf80c20efa2f3af9d8129 [1.7 Microsoft: Print To PDF / -] (PDF.js: 5.4.445 [ec5330f78]) 2 viewer.mjs:15734:13 08:42:07.645 TypeError: can't access property "ownerGlobal", navigatedWindow.windowRoot is null FormHandlerChild.sys.mjs:413:31

   notifyProcessRootOfNavigation resource://gre/actors/FormHandlerChild.sys.mjs:413
   onLocationChange resource://gre/actors/FormHandlerChild.sys.mjs:361
   #pushOrReplaceState resource://pdf.js/web/viewer.mjs:6460
   #tryPushCurrentPosition resource://pdf.js/web/viewer.mjs:6479
   #pageHide resource://pdf.js/web/viewer.mjs:6632
   closeTab chrome://messenger/content/tabmail.js:1128
   removeTabByNode chrome://messenger/content/tabmail.js:1146
   connectedCallback chrome://messenger/content/tabmail-tab.js:99

08:42:33.829 NS_ERROR_ILLEGAL_VALUE: Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIMsgFolder.firstNewMessage]

   onMessagesLoaded chrome://messenger/content/mailCommon.js:1198
   set searching resource:///modules/DBViewWrapper.sys.mjs:999
   onSearchDone resource:///modules/SearchSpec.sys.mjs:528

mailCommon.js:1206:19

   onMessagesLoaded chrome://messenger/content/mailCommon.js:1206
   set searching resource:///modules/DBViewWrapper.sys.mjs:999
   onSearchDone resource:///modules/SearchSpec.sys.mjs:528

All our systems are Windows 11 Pro rigs, domain-joined, with ESET endpoint security installed.

As I store all my contacts in a CarDav sync I have no need for a "Personal Address Book". It might even be a problem because accidentily stored addresses there are not synced. The "Delete" on the context menu is grey and cannot be selected. How do I permantely remove "Personal Address Book" from the list of contacts?

hello, i cannot seem to find a solution online, hopefully someone here can help.

i often receive emails with images attached, and most of the time people don't resize the image. so you can imagine over time this all adds up. i dont always need to keep a 6mb image versions. i would love if there is a way to resize the email image attachment, to at least still have a smaller copy for refence, but not end up with a huge email account (local/pop3)

preferably a one click solution, or even a routine i can run on the file system, etc.

thanks

I would like to know how I can control the timing of compacting the mailboxes under Linux and Windows. The reason why I ask is that every time compacting needs to be done, the prompt to do so comes up as soon as the Thunderbird interface finishes loading but before all of the mailboxes are finished updating,which can take several minutes. If I accept the compacting, it inevitably returns an error that it could not run because the mailboxes are still updating. Or I can cancel until I go through this the next time.

It would seem like a simple matter to either give the user a way to delay the compacting process, or have Thunderbird not initiate it until it is safe to do so to begin with.

I have tried to research this but have not found any answers.