Thunderbird Community Forum

When I open Thunderbird now I suddenly see a whole load of 'Recent Folders' at the bottom of my All Folders list.

All of my folders are suddenly all over the place. Please can someone help?

I have Thunderbird on my Omen 35L on Win 11. Thunderbird CANNOT CONNECT to Comcast to send an email. This was not a problem on Win10. I have done ALL the settings fixes and NOTHING WORKS. Other mail provider accounts send OK (e.g. Site Ground). This is unique to Win 11 and Comcast.

Hello,

I set up my work email account which is based on an MS exchange server, auto configured by TB.

While the inbox was setup successfully and I can receive my emails, however I can't send any emails. I get a error pop up titled "Send Message Error", with the message : "Sending of message failed" , without any error codes. (see screenshot)

Upon verifying the outgoing server settings, I found there are two settings, the first one marked as default was an SMTP setting, while the second one was an exchange setting. I can't send emails using either.

I tried to make some corrections to the SMTP setting : like setting the username to AD\username instead of username@mail-ex.utc.fr and also by removing the first dot in Server Name .mail-ex.utc.fr. Neither of solutions worked.

Please advice on a solution. Also, don't hesitate to ask for further info. Thank you in advance

P.S. Until now I was using Gnome-evolution to access the same exchange account, and it works flawlessly. Evolution's settings are a bit different, like they have OAB server, which I don't understand.

Bonjour,

J'ai des soucis avec une adresse mail, que j'arrive à connecter mais qui reste vierge. Les mails et les dossiers ne se chargent pas.

J'utilise Thunderbird depuis un moment, et j'ai déjà connecter 3 adresses (1 hotmail.fr et 2 hotmail.com) qui fonctionnent parfaitement.

J'ai récemment créer une adresse pour mon entreprise (outlook.com), sauf que cette fois, la connexion se fait bien mais les messages ne se chargent pas. Impossible de recevoir ou envoyer des mails depuis l'application. J'ai testé sur Win10, Win11 et Ubuntu24.

Les paramètres sont pourtant exactement les mêmes que pour mes autres adresses. J'ai essayé d'en supprimer une et de me reconnecter, en me disant que j'avais peut être trop de mail connectées sur l'application, mais ça n'a rien changé...

Ci-joint la capture des paramètres serveur.

Pouvez vous m'aider à trouver le soucis ? Merci :)

Can someone explain why the emails I write are still spell-checked, even though I have unchecked "Check spelling before sending message" and "Check spelling continuously" in "Settings" countless times? Even the Thunderbird add-on "Replywithheader" still checks spelling, even though I have unchecked "spell-check" there too. I don't want spell-checking, but I can't get away from it! It really bothers me.

1. Every time I open my mailbox I have to log in. Before I did not need to log in. 2. Every time I send a e-mail I have to log in. Before I did not need to log in This problems started about 2 weeks ago

How do I get my email to work again. This may be related to the fact that I needed to send more then the usual number of emails a couple of days ago. I haven't gotten emails since then.

Today my Thunderbird stopped downloading new messages. I'm not in offline mode because when I press F5 I can see in the process line in the bottom that Thunderbird connects to the server

But no messages are downloaded. I don't get any error messages?!

When I use my Android phone I can see I have received a lot of emails today, but nothing in Thunderbird?

Hi! I'm trying to set Thunderbird as the operating system default under Win 11. I tried to follow Mozilla's instructions: 1. Open the Settings application by pressing and releasing the Windows Start button, then clicking the gear icon. 2. Click the Apps icon, then click Default Apps in the list. 3. Click the icon under the heading Email to show your choices. 4. Select Thunderbird. The trouble is that at n. 3 there is no choice. There is only 'OutlookAccounts' and this item cannot be deleted or replaced. Can you help? All the best, Robifiori

Hello,

I have saved message templates that I use. Each one also has a footer (which I save as an .html file).

When I use this template to send a message, the image in the footer doesn't load and I get the message: Thunderbird has blocked the file from loading in this message.

When I click UNBLOCK, nothing happens. The image still doesn't get added. It's a very small image from my footer/signature. 'When I compose a new message, I don't have this problem' – the image in the footer loads and is sent to the recipient. This problem occurs when I try to send a message saved in the templates. There's no way to "unblock the image" and send it.

in the last couple of days thunderbird has stopped showing emails from one particular account. Inbox is only showing messages up to yesterday, and all mail is only showing to the day before (?). The messages are on the proton webmail inbox ok, and are received by the proton mail app on my phone. I have not changed any settings, and it worked perfectly before now

Dear community members, Since receiving the Thurderbird release 140.4.0esr on Oct 14th, I have not been able to send email from any of my accounts (2xIMAP and 3xoffice365 through OWL). Nothing has changed in the account settings. Receive works ok. The usual easy fixes do not seem to work (restart, firewall switch-off, etc.). Any ideas beyond having to rewind to an earlier version and rebuild the whole thing (hopefully not!)?

Version 140.4.0esr Build ID 20251010020716 User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Thunderbird/140.4.0 OS Darwin 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:30 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6020

Thank you for your help! Heli

Hi I have just reloaded Thunderbird onto my laptop after installing a new hard drive. It worked Ok until i imported an account and now get this error message even if I uninstall and reinstall.

That appears in a box and thats it.

Cheers Jim

Hello Mail Merge used to work.

But now I get an Error: "NotFoundError - Node was not found".

It's a linux system, everything up to date.

Any ideas?

Hello,

does anyone observe an issue that Thunderbird [140.4.0esr (aarch64) / macOS 26.0.1 (25A362)] freezes for 5 seconds after sending an e-mail? This is super annoying...

Marcin

How do I disable the donation webpage that opens (in Thunderbird) automatically?

A common suggestion is to disable the start page: https://support.mozilla.org/en-US/questions/1226585 https://support.mozilla.org/en-US/questions/1520014 https://support.mozilla.org/en-US/questions/1515838 https://support.mozilla.org/en-US/questions/1507571 That option is already unchecked.

Some seem to be suggesting that this page opens when an update happens: https://support.mozilla.org/en-US/questions/1512477 There was no update installed lately.

I’m using Thunderbird to connect my Hotmail account. The setup shows as “successfully added,” but an error message appears:

“The operation on Inbox did not succeed. The mail server for account responded: User is authenticated but not connected.”

Previously, the connection worked perfectly, but starting this week, Thunderbird can no longer access or sync the hotmail mailbox.

How to fix this problem!!???

When I used to go in to the Thunderbird inbox screen there would be a page with instructions on such things as deleting a message etc. Now, the only way to delete a message is to use "rubbish bin" icon. I would like my "instructions" page back!

Hi, On another laptop (Dell) and copied profile (attached screens). "Send" is gone (Ctrl+Enter works too). Can I reset my profile as it is? Not needing a new profile (I think) or how this helps.

https://www.google.com/search?q=restore+defaults+in+thunderbird&oq=restore+defaults+in+thunderbird&gs_lcrp=EgRlZGdlKgYIABBFGDkyBggAEEUYOTIHCAEQIRifBTIHCAIQIRifBTIHCAMQIRifBTIHCAQQIRifBTIHCAUQIRifBTIHCAYQIRifBTIHCAcQIRifBTIHCAgQIRifBdIBCTY1MDIxajBqM6gCALACAA&sourceid=chrome&ie=UTF-8

Thanks!!!