Late July 2025, I received a Thunderbird update which caused the UI to change and came with a couple of regressions (e.g. I can't tell from the quick filter buttons whether or not they are active anymore). Ever since that update, Thunderbird is no longer syncing my Office 365 "Sent Items" folder. I have configured my Office 365 account as follows: - When I send an e-mail on the account, I configured Thunderbird to *not* place a copy in the account's "Sent Items" folder, because the SMTP server already does it. I can check in the Outlook Web Application (OWA) that this is actually still happening. - This means that sent e-mails do not immediately show up in my unified inbox within Thunderbird (which includes the "Sent Items" folder), but normally they do after I open the "Sent Items" folder, triggering a synchronization. Since the update, the "Sent Items" folder in Thunderbird shows as empty. No old sent messages and no new ones are visible. In OWA, all of them are still there. In fact, the same seems to be true for other folders (except inbox and trash) on the Office 365 account. Of course, what I want(ed) to know is: how do I fix this? I am on Ubuntu 22.04 and currently Thunderbird 128.12 (but further updates may have happened since the regression occurred.) **Baffling addition:** While typing this question and looking through all of these folders on both OWA and Thunderbird, suddenly they synced. All of them. I changed one thing, but only for the "Sent Items" folder (so not for the other folders that were not, but are now, syncing): I right-clicked it in Thunderbird, chose "Properties", and checked "When getting new messages for this account, always check this folder", and then restarted Thunderbird. For now, I conclude that the interaction between Thunderbird and Office 365 is non-deterministic.

GMail introduced a very good feature of automatically filtering emails into categories like primary, social, promotion, forums, updates. Is there anyway to get this filtering in thunderbird in anyway ? (for example, tag, category, or even folder)

I just opened Thunderbird, and an annoying new tab is obscuring my work area telling me "only 3% of users donate…". (I used to donate to Mozilla, and stopped, because of such things, which imho go against Mozilla's mission, but that's totally besides the point.) How do I prohibit Thunderbird from opening a tab loading a website, especially since it's loading an external URL without my consent? I'm on Fedora Linux, so I'm not using Thunderbird's own updater to begin with; I believe that renders "disable automatic app updates" which one gets pointed at elsewhere, irrelevant to my problem. I'm not looking to try out different fork. I want the answer to work with the stock packaged Thunderbird. DNS-blocking and similar ("pi hole") attempts are out of question, because neither do I know which domains this looks up, nor is that (at sensible effort) compatible with my split resolver setup, nor do I assume it could even hypothetically work – I can't be blocking all mozilla domains. The problem here is that I couldn't try *potential* solutions – I can't trigger these popovers, even if they do show up at some loose intervals, to verify. So, I'm looking for "yes, that should work, according to my factual understanding".

Debian 12 (Linux 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux)

>I am starting Firefox from a launcher in XFCE panel where it was placed automatically at installation time. When *Firefox* is running as the default browser and I click on a link in *Thunderbird*, I **always** get the message > Firefox is already running, but is not responding. To use Firefox, you must first close the existing Firefox process, restart your device, or use a different profile. This, as well as other recommended solutions, works but is not sustainable. Having to close Firefox every time before opening a link from an email isn’t practical. Are others experiencing the same issue? What can be done about it? Chromium doesn’t seem to have this problem, at least.

Context: Thunderbird 128.9.0esr on MacOS Ventura Issue: When printing, Thunderbird generates a footer with a page number in the bottom left corner ("1 of X") and the print date in the lower right corner. Question: **How to configure printing to avoid the footer?** Bonus for thunderbird header as well. Because headers / footers are Thunderbird generated, I would think there may be a setting to in Thunderbird: alas, I have not been successful in finding a native control.

Is there an automatic way migrate a thunderbird mailbox to sylpheed while preserving the folder structure. I tried the importexport extension for thunderbird and got a directory with multiple mbox files and subfolder which contain again mbox file. For example inbox1 inbox2 foo.sdb foo1inbox1 foo2inbox1 foofoo.sdb foofoo1inbox1 foofoo1inbox2 foo2.sdb foo2inbox1 foo2inbox2 Sure I can import manually every single mbox file with sylpheed, but is there an automatic way to import all at once and preserve the folder structure?

Thunderbird does not play the sound file when a new message arrives, even though I have it set up correctly: The sound file playes OK when I press the Play button, but when new message arrives nothing happens. The message preview text also is not displayed when new message arrives, even though I have this set up too. What could be the problem? How can I make the sound play?

I installed Firefox and Thunderbird in /opt Both run perfect, but the icon of both in the bottom bar and the switch icons is: When I install the programs with Apt, the icons are correct. Does anyone knows how I can get the real Firefox/Thunderbird idons? I created a link to both programs: /usr/local/bin/firefox -> /opt/firefox/firefox Another picture, all applications have the correct icon, but not Thunderbird: I am running Debian 12, bookworm with Gnome

For some months now a recent update of Thunderbird has messed up a key functionality for me. When I open a message (which in my settings opens a new tab with the message), and I use the MOVE TO dropdown to move the message to some other folder, it will load the next message in the list. So far, so good. However, after moving the message, about 30% of the time the MOVE TO and DELETE buttons are faded out for that next message that appears. I don't understand why - or how to fix this. Any thoughts? How it looks BEFORE moving a message: And this is what happens with the next message:

I use Birdtray to minimize my Thunderbird to the system tray as I often receive and send emails. For the past few days, Birdtray has been behaving weirdly on my Fedora 40 KDE. Whenever I click on the tray icon of Birdtray, a dialog box with an error pops up. It did start the Thunderbird instance but clicking on the tray icon does not minimize the Thunderbird instance. Here is the screenshot of the dialog box. I am facing the same issue with the RPM version. Here is the other screenshot. However, if I use this command /usr/bin/flatpak-spawn --host /usr/bin/thunderbird to run Thunderbird from the terminal, Thunderbird starts without any issues. This is true for both versions. Here is the log output for Birdtray when it attempts to start Thunderbird.

2024-07-05 17:54:19 Birdtray version 1.11.4 started 
2024-07-05 17:54:19 Triggering the unread counter update 
2024-07-05 17:54:19 Window ID found: 0 
2024-07-05 17:54:19 Starting Thunderbird as '/usr/bin/flatpak-spawn --host /usr/bin/thunderbird' 
2024-07-05 17:54:20 Window ID found: 0 
2024-07-05 17:54:21 Window ID found: 0 
2024-07-05 17:54:22 Window ID found: 0 
2024-07-05 17:54:23 Window ID found: 0

Can anyone help me fix this issue? Any help would be appreciated.

Installed Thunderbird on Ubuntu 24.04.1 LTS, tried to use it, got frustrated with it and now not wanting it on my system. Tried apt purge, remove, autoremove, autoclean. Nothing worked. It is still there and launching. There is no /.thunderbird in home dir. This is the first time I'm seeing such an un-removable software. How can I get rid of Thunderbird?

If I start Thunderbird for the first time, it will create a default profile and guide me through an email signup / setup wizard. I'd like to do my this provisioning using a shell script. As a part of my account provisioning, I'd like to create a custom user.js preferences file for Thunderbird . This user.js file might contain custom config entries and preferences for my IMAP/SMTP server. To be able to create a user.js settings file, I need an existing Thunderbird default profile (directory) before. (Where to put my custom user.js file?) The default profile will be a random string like mkxy3j7s.default-release. But I don't know how to predirect this folder name. So I'd like Thunderbird to create this, before I try to write a file into this profile directory. If I run thunderbird --createprofile, it says: Error: argument --createprofile requires a profile name. **Is there a way to have Thunderbird create its default profile for the current user without starting the interactive Thunderbird GUI?** Something like thunderbird --createDefaultProfile would be amazing. So I could do: #!/bin/bash thunderbird --createDefaultProfile findDefaultProfileAndWriteUserJs.sh thunderbird &

I've Thunderbird 115.13.0 on Ubuntu 22.04 and I have my email which is configured properly automatically by Thunderbird for IMAP and SMTP servers from Microsoft outlook office 365. However, now it has problem for both IMAP and SMTP (I can authenticate with OAuth2 in a login page inside Thunderbird without issue). The issue is:

The mail server for account xxx@yyy responded: User is authenticated but not connected

My email belongs to an organisation and I don't have admin rights to change anything to authentication. Any helps would be appreciated for that issue.

I am looking for a way to automatically start Thunderbird 115.13.0 minimized on AlmaLinux 9.4. AlmaLinux uses Wayland, and Thunderbird was installed using dnf install thunderbird. I don't care if it is minimized in the dock or in the top bar, the main thing is that it starts and is minimized. Since Thunderbird does not have such an option (why?), apparently we have to “simulate” a mouse click to minimize it. The proposed solution so far―[birdtray](https://unix.stackexchange.com/a/671861/372935)―didn 't work in this distro: Installed as flatpak, it couldn't find the Thunderbird window and also couldn't find the binary, even though /usr/bin/ is on the PATH. This is probably due to Birdtray's isolation in the flatpak environment, but not sure. Error starting Thunderbird as '/usr/bin/thunderbird ': execvp: No such file or directory $ which thunderbird /usr/bin/thunderbird Compiling Birdtray from source unfortunately segfaulted. Also the script below, using [wmctrl](https://unix.stackexchange.com/a/752323/372935) , wasn't successful.

#!/bin/bash                                                                     
                                                                                
# Start Thunderbird                                                             
thunderbird &                                                                   
                                                                                
# Give Thunderbird some time to start                                           
sleep 5                                                                         
                                                                                
# Get all Thunderbird window IDs                                                
window_ids=$(xdotool search --class Thunderbird)                                
                                                                                
# Iterate over each window ID and minimize the viewable main window             
for id in $window_ids; do                                                       
    map_state=$(xwininfo -id $id | grep "Map State")                            
    window_name=$(xprop -id $id | grep "WM_NAME")                               
    if [[ $map_state == *"IsViewable"* && $window_name == *"Mozilla Thunderbird"* ]]; then
        xdotool windowminimize $id                                              
        echo "Minimized window ID: $id"                                         
        break                                                                   
    fi                                                                          
done

$ ./start_thunderbird_minimized.sh Window not found, retrying... Window not found, retrying... Window not found, retrying... **Weirdly enough, when trying xprop to verify the correct window ID, it can't find the Thunderbird window either. When clicking on Thunderbird window literally nothing happens, whci might be due to Wayland?**

Between the app and x-container there is a gap which result in borders being drawn outside of the app window. This happens on Plasma 5 & 6 for flatpak and pacman apps from Mozilla and Brave (there might be more apps) on X11. Does anyone had the same problem and solved it? Thank you for any hint! **Edit:** When maximized the gaps are gone **Edit 2:** The problem appears also when using Brave

I'd like to set up an instance of Thunderbird on a Fedora VM (with a VPN). I want it to use ONLY an alias I have set up with the email providers. But I will still have to use my real credentials to log into the server. So they are in `.thunderbird` somewhere. I have to deal with websites on that VM that are pretty invasive by nature (rental tenancy applications like 2apply, snug.com, etc). Each are in a Firefox Container. They all have the facility to browse your system to upload files and documents, or 'drag-and-drop' - i.e. I have enabled those scripts in NoScript, and I have no choice about that. I'm worried that information will leak from Thunderbird to the websites, particularly my real email address. I understand/believe/have heard that linux doesn't allow programs to work without explicitly commanding them to do so, but... haven't I done exactly that with the websites by enabling file-uploading scripts? How should I think about this? Is it really a risk?

I run the dovecot imap server and use thunderbird as frontend. The access is password protected, and I see zillion login attempts with leaked passwords. I would like to switch to bi-key authentication and if possible with a FIDO2 physical key too. Is this possible ? I currently use bi-keys for ssh authentication and start to use a FIDO2 physical key.

I downloaded and installed Thunderbird in a specific folder(non default, using tar). I set the --profile argument to point the profile to a specific folder. Also created a a new profile and set as default using about:profiles Even after this still creates a folder in the home directory .thunderbird that contains Crash Reports, Pending Pins etc. Can Thunderbird be set fully portable ?, not set anything in home folder.

I recently upgraded Thunderbird to version 115.0.1 and since then, the MOVE TO dropdown doesn't work when I am reading an e-mail. I am referring to this option: When I browse my e-mails (without opening the mail itself), and I use this dropdown, the e-mail that is selected will move to the chosen folder just fine. However, when I open a particular e-mail to read, then the functionality breaks down. The dropdown is still there, and I can still select a folder to move the e-mail to, but it doesn't do anything. I looked at the log, and this error is produced when selecting a folder to move the mail into: > console.error: "An error occurred executing the cmd_moveMessage > command: [Exception... \"Component returned failure code: 0x80070057 > (NS_ERROR_ILLEGAL_VALUE) [nsIMsgDBView.doCommandWithFolder]\" > nsresult: \"0x80070057 (NS_ERROR_ILLEGAL_VALUE)\" location: \"JS > frame :: chrome://messenger/content/mailCommon.js :: cmd_moveMessage > :: line 167\" data: no]" I am using POP3.

Can it be done? I don't want to use Evolution's calendar... I want to keep using Thunderbird... I have to add some addons (like *lightning*) first right? My goal is to have some calendar-like on thunderbird and replace the one of Evolution.