Thunderbird Community Forum

Hello! It seems Thunderbird emails are suddenly being 'threaded'. It is causing great confusion in my office.

I need to see each email from a person separately in order to find them easily and also to reply to each one at the time it is received.

Can someone please explain in very simple non-techy jargon:- a) How I 'unthread' messages already threaded AND b) How I stop any new ones being threaded in the first place.

Thank you Tylex

Sync with my gmail account is over a day now and still a long way to go. grabs 20 or so emails at a time and then just sits there. All my folders are gone as well. They are there in gmail but not TB.

Running Thunderbird 140.6.0esr in Windows 11. This afternoon I found that one of my three accounts no longer shows up in the folder pane, though it still appears normally in the account settings tab. I can still send mail from it, but can't receive any. The other two accounts appear in the folder pane as usual and can send and receive normally.

Any help getting the account back into the folder pane would be appreciated. -- tralfaz

Starting Feb 8, 2026 my yahoo accounts no longer work in Thunderbird. I have accessed these for over a dozen years using Thunderbird. In addition, when I open Thunderbird at all I end up getting endless loops of yahoo login messages. The mechanisms in the messages do not work at all. I have received no Yahoo mail since that date. To troubleshoot the issue I tried logging into the accounts directly through Yahoo. Broken, with no access at all to any help resource from Yahoo. Although Yahoo seems to be keeping mum on the problems, there is spotty information online that Yahoo servers were breached a few days ago. One report claimed that user data for about a billion accounts was compromised. I suppose that may explain why my accounts no longer work anywhere- neither from Yahoo itself nor within Thunderbird. Is there a way to disable the incapacitating yahoo popups pending any larger solution to this?

I have been using ThunderBird on Linux Mint for some time now. I am using Outlook.com for emails, calendar and contacts and I sync with another laptop and mobile phone. All fine until a few days ago when I noticed calendar events were not syncing with my phone. I found one calendar event in ThunderBird had an error when I manually synced with TbSync. The error report did not say anything specific. I deleted this calendar event and TbSync ran successfully uploading 2 events that it had not uploaded due to the calendar sync error. I then wanted to manually recreate this calendar event in ThunderBird. When I clicked on "New Event", the Calendar New Event pop-up window did not appear. When I minimised the ThunderBird window, the New Events was not behind it. The ThunderBird icon pinned to the panel had a "2" in the corner. When I hovered over the ThunderBird icon in the panel, it showed both the ThunderBird window and New Event window preview. When I selected the New Event preview window in the panel, it still did not become visible. All I could do with with New Event preview window in the panel was click in the 'X' to close it. I checked for Lightning Calendar Tab add-on updates. It was up to date. I check the settings. All OK. I disabled and enabled this add-on. Still not working. My Windows habits made me shutdown and restart my device. Still Not working. When I checked the other ThunderBird functions, New Event pop-up windows appeared for Emails and Contacts but not Tasks which had the same symptoms as the Calendar.

My Thunderbird crash whenever I tried to "save as" an email, save the attachment of an email, attach a file to an outgoing email.

Every time I did the mentioned, Thunderbird prompts the normal window of my laptop's folders, but it disappear in a second with the Thunderbird crash and quit.

This situation happened after I installed MS365 on my laptop.

I did try the below: 1. Reset attachment directory - mail.compose.attach.dir 2. Run in trouble shooting mode 3. Repair folder index 4. Clear cache

Anyone can help please?

I've attached a screen shot of the main folders seen when I view these as 'Unified Folders' with folders names starting with *01, *02, *03 etc. Somehow, *04 is no longer appearing in this list and has instead appeared inside the *03 folder as seen in my second screen shot. I don't know how this folder and the many sub-folders it contains was moved into the *03 folder and no matter what I do, I can't move the *04 folder out of the *03 folder to sit where it should between folders *03 and *04. Can anyone point me in the right direction to move the *04 folder into the desired location? Thanks in advance, SteveJ

I have been dealing with this issue for the last several thunderbird versions. I am currently running 115.18.0

Everytime I try to configure an existing gmail account for thunderbird via File -> New -> Existing email account

I specify my Name and gmail email address, then password for the gmail account.

The google authentication pop up launches " Mozilla Thunderbird wants to access you Gmail" and I click "Allow"

As soon as I click "Allow" I am asked to download a file.

Google gemini says this file is a sign that Oauth is not being accepted by thunderbird.

What I have tried. I verified Thunderbird is set to accept cookies I have verified there are no previously stored gmail passwords (as this has never worked) I have changed my default browser from Firefox to Brave and verified the same behavior

please help, Thunderbird has never been able to connect to gmail when running on this Ubtuntu install.

Reguarly with some month between I can´t send email. After many days, which is impossible to use, it is ok without doing anything.

Haven´t manage to send in many days and now it is huge problem.

When I click on send buttom on the email come text about the fail which is 100% wrong.

It say: An error occurred while sending mail. The mail server responded: (then come my email adress): Sender adress rejected: not owned by (the part of my adress in front of @) Please check the message recipient (my email adress) and try again.

This text is 100% wrong because all things is as always! Never changed it. And seeing it in setting it like it should be!

I am almost given up, this come always with months between and that is hopeless.

Please help!

I recently booted up a new installation of Thunderbird on a new laptop running Fedora Linux after my old Laptop running Ubuntu died. Fortunately, I had been regularly backing up the old machine with Deja Dup. I restored all my files from a recent backup. All my files seem to have been successfully recovered except that many locally-stored Thunderbird messages are missing, and some local folder names have been corrupted.

Since I see problems only with Thunderbird, I suspect the problem lies there rather than with Deja Dup.

Has anyone else had problems with restoring Thunderbird from backups? Is there something I might try to recover the missing messages and corrupted folders? Should I be using a different backup in the future?

Oddly, when I tried to create a NEW folder using the same name, BOGUS AI PRAISE-MKTING-BOOK CLUB BULLSHIT, it did not work. I created a folder with a simpler name, AI BULLSHIT, and that worked. But I had over 400 emails stored in the folder that disappeared, and I would like them back.

Changing color of the text during composing an email does not work when I use "Choose a color" button. The color in the button changes, but when I click "Ok" the color does not change. The color change works though if: I click "Last-picked color", or when I type color name "Green" or HTML hex, and subsequently click "OK".

How to change the color of text in a composed email when

I am using Thuderbird on macOS.

When trying to run in Safe Mode, and compose a new message, I the Thunderbird stucks, so I cannot confirm in Safe Mode, but I had this issue in the past also on other machines/Thunderbird instances, so maybe someone else had a similar problem, or maybe it is a known issue, already in dev team logs.