Thunderbird Community Forum

The held I did find looked like it was from an earlier version, many items in that example are not on the new message form for Ver152, in particular can attach a variety of things but File is not among them.

I got a message: "Authentication failure while connecting to server outlook.office.com." Please assist in getting this resolved.

Thanks

The Thunderbird calendar, displayed by the week, Saturday June 27-Friday July 3, 2026 in my computer says today is Monday, Jun 28, whereas it is really Jun 29. Each day in the calendar is off by 1 day. e.g. tomorrow it says Tuesday Jun 29, etc. If I change the view to Multiweek, the dates and days of the week line up as 2 June 29s for Monday and Tuesday!. Wednesday becomes June 30 and Thursday skips July 1 and is July 2! What to do to correct all of these problems? Thanks, [edited email from public]

I have several MBOX files with me and I want to import MBOX files into the Thunderbird email client. I've come across different methods, including manual techniques and third-party tools, but I'm unsure which approach is the most efficient, especially when dealing with multiple or large-sized MBOX files. Some methods also seem complicated for users who are not very technical.

Suggest me any reliable tool for this!

I am using Thunderbird 152.0 in Win 11.

I am trying to move about 100 emails from one folder to another in the same account. 1. I have selected all those emails to move and dragged them to the new location. One email moves. 2. I have selected all those emails to move, right clicked and selected Move to/email account/different folder. One email moves.

These methods used to work and all emails selected would move. For some reason they don't move except one.

What am I doing wrong now?

I added thunderbird to my new computer while the old computer still had thunderbird up. I noticed that it tried to add my two account data after I created them, but the old accounts were for pop mail. After finding out that I needed to turn off getting mail (which was not working, but trying) I added the two accounts again as IMAP accounts. I discovered that I had to move my old folders to the new accounts (copy only seemed to work sometimes), but it was tricky and SLOW for large folders. The main thing I learned was that I had to click on the old folder in the pop account and move it to the TOP level of the new IMAP account. HOWEVER this was slow for many folders and did not work for the "built in" folders. I looks like files are first moved to the server, then back to the new account on the new machine. I think with all of my fumbling around trying to get the transfer to work, some of the files (it looked like they had html in them) got corrupted and would not transfer or even delete until I moved them to a temp folder in the same account, after which I could move the files which I highlighted, but I had to create the folder first. To keep things from being confusing I deleted the now empty folders in the pop account as I moved each one. As I said moving the files was slow, and until I realized this I might have tried to do moves too quickly. At any rate, when I was done I had several duplicate folders in the IMAP account when I was done. The empty ones I created all deleted ok, but there are still two copies of Draft folders in each of my accounts, one empty, one with my files. How do I remove the duplicate empty folder?

Hello, since 2 weeks the IMAP settings don't work. I didn't change anything with the accounts. Regularly I had to update the settings on my android version and it works well. But on my windows version ou on my linux version it doesn't work. I enter different name (the surname only, user name, or the mail address or name and surname). I tried all the options but it didin't word. I stopped trying last week on Thursday and tried again friday afternoon. I tried again several options and it works until saturday. Again I didn't change anything. I receive the notifications (in french) : "can't access the server outlook.office365.com" for the accounts. It was on my windows version AND on my linux version. I really don't know how I can fix it. I cleared the cache several times. Verified the server names. Today I serched for the settings on outlook for the IMAP server but didn't find how to change or disable it (the option were not visible on the setting page). I deleted the accounts to add them later but when the windows popup open even if I enter my password, and the code (if necessary) thunderbird send a message like "error. verify the id, username, address or password". I tried with the new thunderbird version on windows (because mine was old) - didn't work either. I don't know what to do or try now.

I have the android version and it works well, but this is on a secondary device and I absolutely need my mails on my main device and I really love using thunderbird. I even installed it on my kids devices. I really don't want to install another email client.... and absolutely not outlook T-T.... My thunderbird on linux is updated and didn't work too. But it's on my main device too, so if you can help me make it work on linux, I'll be happy ^-^.

I thought it was a connexion problem but even when I change it, it didn't work (on windows or linux).

Please can you help me fix this problem ?

Edit : Just wanted to add that the version on Linux (Mint) is the 140.12.0esr

Hello,

we have a reproducible issue in Thunderbird when forwarding emails with attachments.

Environment: Windows 11 Professional Thunderbird version 152.0 (The issue also occurred in the previous Thunderbird version) POP3 account Mail provider Strato AVG Business Antivirus installed, but the issue also occurs after testing AVG related settings Issue occurs with different attachment types and sizes, for example PDF and DXF files

Steps to reproduce:

1. Open an email with an attachment. 2. Forward the email using Forward Inline. 3. Add recipient and some text. 4. Save the message as draft. 5. The first save works. 6. Save the same draft again, with or without changing the text.

Actual result: The second save fails with an error message similar to:

“Your message cannot be saved as a draft. There was an error attaching [filename]. Please check if you have sufficient access rights to the file.”

Expected result: The draft should save repeatedly without an attachment error.

Important observations: The problem occurs with all tested attachments, not only one specific file. The file size does not seem to be the cause. The issue also occurred with a small DXF attachment of about 355 KB. The issue also occurs in Thunderbird Troubleshoot Mode. The issue still occurred after creating a new Thunderbird POP3 profile and downloading the remaining emails again from the Strato POP3 mailbox. Changing the draft folder did not solve the issue. Removing temporary Drafts files and rebuilding the Drafts index did not solve the issue. The issue originally appeared to be related to AVG, but later tests showed that AVG is not the main cause. If the automatically inherited attachment is removed from the forwarded message and then manually dragged again from the original email into the draft, the draft can be saved without problems. Changing forwarding mode from Forward Inline to Forward as Attachment solves the issue.

Conclusion: This looks like a Thunderbird issue with automatically inherited attachments in inline forwarded messages. The first draft save works, but on the second save Thunderbird seems unable to reprocess or resolve the inherited attachment and shows a misleading access rights error.

We would appreciate any advice on how to further troubleshoot or resolve this issue. If this is a known bug, we would also be grateful for any information regarding a planned fix or available workaround. We are happy to provide additional information, screenshots or perform further tests if needed.

Thunderbird on 2 computers when mails are deleted on first computer it then lands in TRASH but it also deletes them on second computer where it does not land in TRASH.

Hi, I keep getting a login to account failure error message. It reads "Login to account "xxx@xxx" failed. Login to server mail.xxx with username xxx@xxx failed." This issue is occurring on an iMac. The same login credentials work on my Thunderbird Macbook Air. The support at Siteground were unable to resolve the issue, except to say, after a successful test at their end, that the problem must be with Thunderbird. The version I'm using is 152.0 (aarch 64). I've tried a quit and re-install more than once. Can you help?

On upgrade to 152.0, a pop-up asked for options I have not seen before. I cannot find info about what the net.thunderbird option is, nor why I would or would not want to click it? Any help out there?

Thanks!

Whenever I restart Thunderbird, I have to change the settings back to "Table view," 20 recent folders, sorted alphabetically. This occurs on only one of my computers (Windows 11). My guess is that the settings file must be corrupted. How do I fix that?

TB address book has duplicate entries or other entries that will not delete or edit? Tried to even change the name. Close reopen and it reverts back to original. ??? Thanks for the help.

My folder header has many extra icons that when click do nothing -- happened when updating to 152.0 (and I need to hit ALT several times for the command line to appear to be able to "view folders" Tbird doesn't load to them automatically ! )

Here's a screen scape -- note the "what looks like a document" goes on and on and on if I scroll right

I have an old iMac running macOS High Sierra. After a power surge last night, I have been unable to access any mail accounts. Apparently this is because my iMac cannot use two-factor authorization. The recommended fix is to use Mozilla Thunderbird. I downloaded this, but when I double-click the .dmg file, I get a corrupt image message. I am wondering if this is because I have a 32-bit machine.

I have 'Allow remote content in messages' turned off.

When viewing a message with remote content, I see the bar "To protect your privacy, Thunderbird has blocked remote content in this message", however the 'Preferences' dropdown described in Remote Content in Messages does not exist...

I want to show remote content for a single message, but this seems impossible!

What am I doing wrong?

Hello.I just want to let you know,that somehow the client what i uzsdeing is forget to make undread massages to read when i takea look at them.When i double clivck on them they open a diffferent page and then they get read status.What could cause this?