Thunderbird Community Forum

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.

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.

Hi, I have used "takeout" years before but not one of these.

https://www.google.com/search?q=download+Gmail+MBOX+viewer+tool&oq=download+Gmail+MBOX+viewer+tool&gs_lcrp=EgRlZGdlKgYIABBFGDkyBggAEEUYOdIBCTE5NzE5ajBqMagCALACAA&sourceid=chrome&ie=UTF-8

Can I keep folder integrity using one of these? And how if not obvious.

Quota is high.

Thanks

Dear people,

problem: threaded view is enabled > when the child has a new message, the top message is not bold but only underlined. Without opening the thread, I wouldn't know that there are messages in the thread.

Example: Actual default style: In the view, it appears like this > Thread top message

v Thread top message

  - Old Child message
  - New Child message

The style I prefer: In the view, it appears like this > Thread top message

v Thread top message

  - Old Child message
  - New Child message

(see also screenshots for that).

As the solution in https://support.mozilla.org/en-US/questions/1265223 did not work anymore (since starting with Thunderbird 115+ the message list was rewritten from XUL treechildren to a HTML-based table view) I wanted to post another solution if someone stumbles upon this problem via google.

1) Enable customized stylesheet support: a) ☰ Menu → Settings → search for config → Config Editor b) Search for "toolkit.legacyUserProfileCustomizations.stylesheets" and enabled (set it to value "true") it by double clicking

2) Edit the Thunderbird styles by adding your customized stylesheet: 1) Help → Troubleshooting Information → Profile Folder → Open Folder 2) Inside that folder, create chrome/userChrome.css (folder name and filename must exactly named like this; pay attention to not create a userChrome.css.txt by accident when using an editor) 3) Put this into the userChrome.css: /* Collapsed thread that contains unread messages → bold */ tr[is="thread-row"].children[aria-expanded="false"][data-properties~="hasUnread"]

 .subject-line span {
 font-weight: 700 !important;
 color: #000000 !important;

}

/* Keep correct color when selected */ tr[is="thread-row"].children[aria-expanded="false"][data-properties~="hasUnread"][aria-selected="true"]

 .subject-line span {
 color: var(--listbox-selected-text-color) !important;

} 4) Save the file and restart Thunderbird

Bonjour, j'utilise Thunderbird depuis plusieurs années et j'ai plusieurs comptes de messagerie. Je suis à la version 140.7.1esr. Depuis plusieurs jours, j'ai le message "Saisissez votre mot de passe pour alain.jouenne1@orange.fr". J'ai beau saisir le mot de passe, rien n'y fait. Ma config est Windows 10 64 bits, 3 adresses Gmail, 2 adresses Wanadoo et cette nouvelle adresse orange qui me pose problème. A noter, lorsque j'ai eu cette nouvelle adresse, je l'ai configuré dans Thunderbird et elle a fonctionné. Et puis, un jour, j'ai eu ce message. J'ai même modifié mon mot de passe de messagerie, mais cela n'a pas fonctionné. Pouvez-vous m'aider ? Merci d'avance

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 became a THunderbird user recently to help me transfer e-mails from one system (e-mails sent to my e-mail address being collected by Gmail using POP3) - I have a gmail.com address too which shows all the e-mails in the same Inbox. Google are withdrawing support for Pop3. I am moving to Hostinger which happily collects and displays all my emails on its Webmail service. Thunderbird is a great tool for moving e-mails fro Inbox (and al other folders) from the Gmail to Hostinger. But yesterday it crashed and wouldn't restart = white windows says at the top 'not responding = and Windows Task Manager shows me Thunderbird still seems to be talking to one of my accounts and has 6 other tasks open. I stopped those tasks and closed Task Manager. I have uninstalled and re-installed but it comes back with the same symptoms and same tasks running. How do I stop this and get it back properly again

Over the last week I have been experiencing issues that prevent me from using Thunderbird on my computer. It had been working for a few weeks prior, with emails sending without issue. Without any apparent cause, and with the correct credentials set in my account settings, emails are no longer sending. They continue to be received with no issue, and I can move emails into folders etc.., which I immediately see reflected in Webmail. I get the attached error, every time I try to send an email, no matter which address I am trying to contact. I can log in to my account with the same credentials on different software on the same computer, and I have no issues with sending emails from that software, so I can't see how this would be an issue with my computer. I have tried removing the account, and adding it again. The credentials are accepted, but the issue persists. The email also works without any issues via Webmail. I have contacted the hosting company for support, but they have confirmed that this is an issue with Thunderbird. Please can somebody help?