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Hello all!

I use Thunderbird as a local archive for my email. I have two accounts in the application: my home email via my ISP (POP) which I predominately use and my gmail (IMAP) which I don't generally use. There are years of messages in folders and sub-folder under the POP account, but nothing under the IMAP.

I’m up to date with Thunderbird at v140.1.0esr (aarch64) on my iMac with Sequoia 15.8.

On 07/22/2025 I went to download some messages via my ISP POP account and saw that a whole bunch of my email folders no longer had any subfolders and were empty of any messages. Some were also duplicated. Please see the attached image.

I haven’t changed any settings in years, and I do not have any add-ins. One of the nice things about Thunderbird has been its solidity and simplicity.

After every session, I would empty my trash and compact.

Suddenly my email seems to be gone along with sub-folders while top level folders are duplicated.

Wondering if anyone has any suggestions on how to troubleshoot this? Since I don't do anything fancy with the application and with the suddenness of this issue, I can't image I'm the only person having it? I’m quite concerned I may lose many years’ worth of messages.

Thanks much in advance! CPRoot

I have setup a new IMAP with Thunderbird and my deleted messages are not displaying in the Trash area. I am currently on release version 141.0 (64 bit). I am running it on Windows 11 Pro service pack 24H2. I do not have any antivirus setup at this time.

First off I have multiple Trash bins, one for each account listed under the Inbox and then one in the Local Folders area, so I am not completely sure why the Local Folders one exists and what it's purpose is for. When I delete a message from the DrReilly account it is removed from the Inbox and and I see the number count go up on my Trash folder under the Inbox. However, when I go to the Trash folder it is completely empty but indicates I have messages in it (see Screenshot 1). I have toggled Unread, Stared, Contacts, Tags, & Attachments and the messages never show. I have verified that when I delete a message it is supposed to direct the messages to the Trash bin (see Screenshot 2).

The interesting thing is my issue is only with the DrReilly account, the deleted messages are showing up in the AHAH account (also an IMAP) with no issues. The only thing I can see different about the 2 accounts is that in the AHAH account folders it has a Trash & a Trash.msf file (see Screenshot 4) and the DrReilly account folders only have the Trash.msf file (see Screenshot 3).

I have tried everything I can find with a search and nothing seems to resolve the issue.

Can someone please help?

I use Thunderbird as a client for both my Gmail and my Outlook accounts. I recently received a message from Google saying that 73% of my Gmail storage is full. The message contains suggestions as how to free storage space, and I chose to delete many emails with large attachments. Since then, an error message opens every time I open Thunderbird for checking for new emails. The message says :

The folder 'Inbox on keldmhansen@gmail.com' could not be compacted because writing to folder failed. Verify that you have enough disk space, and that you have write privileges to the file system, then try again.

This is very confusing since I have cleared more space for more messages. I have no idea how to solve this problem that keeps reappearing, and I never changed any settings, passwords or anything like that.

How can I solve the problem ? Thank You

I use Thunderbird 140.0esr (64 bit) under Windows 11. In recent days I can usually not move or copy an email message between folders, though occasionally a move succeeds for no obvious reason. For instance, I right-click an email in my Inbox and ask to move it to folder abc. It disappears from Inbox but does not show up in abc. If I look for it in All Mail it's there, but I cannot move or copy it to abc from there either. Usually I get no error message, but today I got one saying I should check my write privileges and disc space. I searched on a browser for write privileges and found information about Windows but nothing about Thunderbird. I have adequate disc space. This problem only appeared on about 29 July 2025; before then, moving and copying worked reliably both by right-clicking and by drag-and-drop.

Owing to a price rise in MS Office, I had been looking to move to free software. Unfortunately for email this isn't working. I have downloaded Thunderbird and have tried to transfer my Outlook data there. I started two weeks ago and on average believe the process has been running a few hours a day, for much of the time when I look occupying 0% of CPU capacity, and most of the time not rising above 1%. The import has been stuck at 33% for that time, which I assume means that it imported Accounts and Settings or Address Books quickly and is taking a very long time to import Mail Messages. (It imported the couple of month's worth on webmail quite quickly.) Likely this is owing to the size of the Outlook file, 5 GB. Does this essentially make the transfer impossible? For how large a file could Thunderbird do a successful import?

When I open "New Message," the form shows "No Subject" and will not let me enter a subject. Also, I have trouble using the cursor to go back to correct/change a word. I have to use the arrow keys to move around the message. I'm using Windows 10.

Emails appear correctly as delivered in Inbox pane, and can be opened, however when deleted the email disappears from the right side viewing pane but not from the Inbox pane. This leads to the next email being displayed in the right pane but the deleted email header remains higlighted in the left Inbox pane as if it was that email being displayed. This behaviour persists even in Troubleshooter mode. Troubleshooter mode did not start smoothly, telling me that Thunderbird was still running and required closing. I have reinstalled Thunderbird and the above behavour persists. The bahviour persists on my laptop only, not on a desktop with the same profile. The behaviour is quite disorientating, as emails that have been deleted continue to show up inthe Inbox pane unconnected to the email being displayed. One or two incorrect deletions have therefore occured. Picture below attached - the INOV8 email has been deleted. The next email appears in the right pane but the INOV8 email remains in the left inbox pane. When this eventually updates the inbox pane and display pane can be several email out of synch. Any suggestions?

I am trying to save a template and TB (141.00) keeps saving it in the 'Local Folders' template subfolder. I found this archived thread about this issue: https://support.mozilla.org/km/questions/1420516

I have changed the target folder to the appropriate account subfolder, closed/restarted TB, and this behavior persists. Anybody got a solution?

Hi,

I am trying to setup my email on Thunderbird android but auto configuration is not working it is however working fine on desktop. It is my own domain email and I have set up the DNS settings correctly following the below guides.

https://www.axigen.com/documentation/dns-configuration-p60719104 https://www.axigen.com/documentation/dns-based-service-discovery-p47120690 https://www.axigen.com/documentation/axigen-auto-discovery-p49119962 https://wiki.mozilla.org/Thunderbird:Autoconfiguration https://rseichter.github.io/automx2/#muaconf

Any help on this is much appreciated.

Thanks, Mat