Thunderbird Community Forum

Thunderbird causes my machine to 'hang' from time to time, often for up to a second and usually a number of times in quick succession on each ocasion. Sometimes this happens frequently - say every 5 or 10 minutes - sometimes only after an hour or more since the past occurrance. My machine hangs completely - nothing will work, mouse, keyboard, sound, other apps etc. If I happen to be typing (into any app - including Thunderbird - when this happens, input ceases, the cursor freezes and - if the problem persists for a second or two, Windows reports "[app] is not responding" I cannot be certain, but I believe the problem occurs whilst messages are being retrieved.

This is a very serious problem as it means that I can never leave TB running as the problems it causes are not acceptable. This means I cannot deal with incoming messages without periodically re-starting TB - which is an utter PIA.

I am running Win 11 Professional on a 2-year old machine with 64 Gb of memory. I have run TB in Troubleshoot mode, I have confirmed that the problem occurs regardless or whatever other apps are running (or none) and I have proven conclusively that no other app causes any kind of similar problem.

Looking forward yto hearing if others have had the same issue and what can be done about it.

Hi, i cant log in from my thunderbird from my outlook account. I can do it with two of my acounts but not with the third one with the adress daniel.r.76@outlook.com

Hallo, warum werden meine Vorlagen bei Thunderbird Mail gelöscht. Thunderbird 148.0.1 64Bit Vielen Dank X@t-online.de

Hallo. Vorbereitete Hilfeartikel in Ihrer Sprache finden Sie unter dem Link „Hilfeartikel“ oben auf dieser Seite. Freiwillige, die Ihre Sprache fließend beherrschen, beantworten Ihre Fragen jedoch auf einer anderen Website. Wenn Englisch also nicht Ihre bevorzugte Sprache ist, stellen Sie Ihre Fragen am besten auf der folgenden Website. ... Thunderbird-mail.de - http://www.thunderbird-mail.de/wiki/Hauptseite oder Hilfe - https://support.mozilla.org/de/kb/hilfe-durch-unsere-gemeinschaft-erhalten?exit_aaq=1.

(PII redacted by moderator)

The other day previews of messages quit working in Local Folders>Inbox. New messages will show the preview, but not any of the older messages. The preview area is just blank. I drew an arrow to the preview area.

I recently replaced my Mail with Thunderbird. The left pane successfully loaded my mail folders but now I want t create new folders and insert them alphabetically. How do I d this?

"Could not connect to server mail.atmc.net; the connection was refused" message after the installation of version 149.0. I've verified my server settings & turned off the firewall setting & it still won't connect. It worked find before 149.0 installation.

PDF file attachments were working fine and now they don't.

I get no error message, but nothing happens when it's set to open in Acrobat. I can view the file in "Preview in Thunderbird" and the file isn't corrupted as I can save to disk and then open in Acrobat.

I tried restarting TB in troubleshoot mode with add-ons disabled, but that did not solve.

Thanks for help!

My email works at first, then after a while it says incorrect password and asks for my password. I enter the correct password (100% correct) and it says wrong password, and it won't work again until I start the computer next time and enter my password. (it works, downloads my email, then after a while it all repeats) Thunderbird. (recent download) Windows 11.

I have been using Thunderbird with two POP3 Hotmail accounts for some time and I am trying to set up a third account with exactly the same configuration. However, both the automatic and the manual configurations failed. The new account receives mail, but the outgoing smtp server config seems to have a problem. Sending messages times out or keeps prompting for a new password.

The Hotmail account has POP3 and IMAP enabled. Thunderbird is set to receive all cookies. I cleared history and cache after every attempt and also temporarily disabled the firewall.

Any suggestions about what the problem could be?

Hi folks. Suddenly I am having a problem with my e-mail account. I was working with T’bird this morning without any problems. Then I went to open my Firefox browser and I got a message that it wanted to upgrade to the latest version, which I did.

Now suddenly T’bird isn’t working. I got the message “ Enter credentials for (me) on smtp.gmail.com”. It has given me a Sign in page. My e-mail address was populated. Clicked on Next and got a message from Google “400. That’s an error. The server cannot process the request because it is malformed. It should not be retried. That’s all we know”

I haven’t made any changes to T’bird. My smtp is still the same. I have just looked at my Gmail on my iPad and the only thing I notice is on the menu list there is a link to ‘upgrade’ - I am not risking that yet!

Any suggestions?

My provider changed from q.com email to myctl.net email. I was using outlook but it wasn't downloading new emails. They are on provider web mail. When I downloaded Thunderbird it asked about importing from Outlook and I did. Now it is trying to download the 36,000 emails on the server site and going very slowly and I can't open the ones it has downloaded, I think because it was sent to q.com. Can i uninstall Thunderbird and then set it up again without importing anything?

I installed Thunderbird 149.0 on Linux Mint 22.2 and I can't figure out if it's a release or a beta. On the downloads page, the "Release" section lists 148.0.1. The "Beta" section lists 149.0b4. The "Help - About Thunderbird Beta" window says "Release notes." I'm confused: what are these?

I have Thunderbird Version 140.8.1esr | Released March 10, 2026 on windows 11. The problem started 2 days ago when I couldn't receive emails on desk top or the iPhone. I looked on the web to see why I wasn't getting mail on my @yahoo.com mail. The web showed that yahoo had trouble in the eastern US. Not knowing what to do I deleted the email on my iPhone and tried to reinstall it, but couldn't. I didn't have the email password. (The one I had saved wasn't accepted.) I don't know how I got email back on the desk top, but it is working now. I think if I can change the email password on the desk top I can then reinstall it on the iPhone. On another computer on the same WiFi which has a g-mail address also using Thunderbird there was no problem getting mail.

I recently transferred to a new Win 11 system. I copied the profiles over and all my address book and settings are working. I have found that my calendars are not. I have three sub-calendars attached to my Home calendar, one was downloaded "USHolidays" and is working, the other two I created and are grayed out. The hover message says they are "momentarily not available." How do I fix this so they appear?

I have been using Thunderbird for ages now with no problem, but I suddenly realised that no recent emails were appearing from my Gmail account. I have tried everything suggested on line to resolve the problem, including uninstalling and reinstalling Thunderbird, and deleting and re-entering my acccount details but neither the IMAP or SMTP servers will connect to Gmail. I have reset all of the server settings on Thunderbird, and have checked that Gmail is IMAP compliant (which, apparently, is is now automatically). I have spent hours trying to sort this out and am just at the point of abandoning Thunderbird completely, but I am loathe to do so if there is a solution. The latest error message i have received is "Unable to log in at server. Probably wrong configuration, username or password" but I don't know what else I can check or change.

I encountered the following problem while using Thunderbird 140.8.1esr (64-bit): While moving an email from the "Inbox" folder to an archived folder named "2026", I noticed that the archived folder had disappeared! All my searches for a solution have been unsuccessful. Do you have any suggestions? Sincerely.

Bonjour, Les mails n'arrivent plus automatiquement dans ma boite mils et quand ils arrivent ils ne s'ouvrent pas (ou alors 2 jours après...). Message : le certificat pour imap.gmail.com.993 ne provient pas d'une source sûre ! La fenêtre "Ajout d'une exception de sécurité" s'ouvre et rien ne fonctionne si je clique sur "obtenir le certificat" ou "confirmer l'exception de sécurité"....J'ai tout testé sur cette fenêtre... Je ne suis pas du tout informaticien... Pouvez-vous m'aider rapidement ? Merci. TAMINIAU Yvan yvan.taminiau@gmail.com