Thunderbird Community Forum

I had TB on my desktop for years and finally got it also synced to my phone. Then with a failure with Windows 11 had to wipe clean the desktop and start over. Cannot reinstall TB. I obviously have the correct e-mail and password as I was able to log into Mozilla and submit this question. I believe it is a problem with my user name and what is on my phone setup does not work with my desktop reinstallation.

My email account is set up with 2fa with an app-specific password for Thunderbird. I manually updated all the info in Passwords, but TB still won't connect. Under Setup it keeps saying "Authentication failed: Check username and password" but both are entered correctly. Under "YourLogin", I have re-entered two different formats but still fails. I also set the SMTP server settings to match email account.

  I've been fighting this for too many hours.  Can somebody help me get connected?

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.

My internet provider has required a new account password for my wife’s Thunderbird account. We have changed the account with the provider, but I cannot figure out how to change it in Thunderbird so she can logon and send email without having to re-enter the password each time. Several online searches have provided various “solutions” that lead to non-existent menu choices.

This shouldn’t be this hard! Is there a way to address this with a phone call to a knowledgeable real human being??

When I log into thunderbird, warning messages keep coming up asking me to input my password. The messages keep coming even when I put in the password. It takes a long time to download messages and almost allways blocks me sending. I have to to my providers webmail to do any work.

My school email's storage and emails will expire end of today (June 30th, 11:59 PM EST). I accidentally thought the account would just be frozen at that time, but realized they would be deleting the account all together for universities alumni.

When I downloaded Thunderbird to transfer my emails, I'm logging in, but I'm getting prompted to log in to Microsoft rather than Gmail for some reason. The email should be Google Workspace. I'd love to know what's going on as I'm not sure and my school's IT support said it's a problem with Thunderbird as it should be gmail for me.

Anyone know of any fixes or suggestions?

Hallo zusammen, ich habe Mozila Thunderbird im Einsatz. Mein e-Mail-Konto lautet: [edited]@t-online.de.

Seit Ende Januar 2026 kann ich keine e-Mails mehr empfangen. Klicke ich auf den Button "Nachrichten empfangen", erscheint folgende Meldung: Anmeldung auf dem Server secureimap.t-online.de mit Benutzernamen "[edited]@t-online.de" fehlgeschlagen. Über mein Handy kann ich die eingegangen E-Mail ansehen. Warum auf meinem Laptop nicht?

Bisher habe ich noch nie ein Passwort eingegeben. Was muss ich machen?

Im Voraus vielen Dank.

Mit freundlichen Grüßen

Sandra Oberle

I am trying to add one of my Google email accounts to Thunderbird. It brings up the "Sign in with Google" window, which is normal. But instead of "Sign in to continue to Google...", it says "Sign in to continue to Mozilla Thunderbird Email". Which then generates an error: "Error 400. The server cannot process the request because it is malformed. It should not be retried. That’s all we know." I've not ever experienced this issue before; adding a Google account has always been super easy and straightforward.

I recently moved from Microsoft Outlook email to Apple icloud email. icloud allows you to create an application-specific password, which I did for email. It works; I can login to email on Thunderbird using my (impossible to remember long) password automatically generated by Apple. I switched the Thunderbird server settings to OAuth, but unlike with Outlook, there was no popup saying a restart of Tbird is required. When I quit Tbird and restarted, it did not prompt for a pw, but neither did it get any new messages. (I sent new messages from another email service to verify.)

I also noticed that OAuth2 was not an available option for the outgoing server, as it was with Outlook.

Does OAuth2 not work with icloud email?

There appears to be no way to change the app-specific icloud pw in Apple, but I will take that up with Apple.

Perhaps the workaround is to use the Tbird saved pw feature?

The password that was accepted to log into Thunderbird now isn't accepting that password anymore, and when I try to send my father email, it givesves error message. It says, "Sending message from michael.moon@austin.rr.com has failed". Now it doesn't give me a prompt to log into Thunderbird.

Hello, Previously, I had my email with Xfinity, but they stopped this service and set us to Yahoo Mail. I’ve had no luck in setting it up in Outlook, so I tried Thunderbird and encountered the same problem. I have Windows 11. I’m using the IMAP settings recommended by Yahoo. During the setup process, everything checks, but when it asks for an address, which is from Xfinity, and a password, which I’m not sure they’re asking for so I tried the Xfinity, Yahoo, and Mozilla passwords. I get the authentication error on each attempt. Help! Thanks, Parris

TBird connected to AOl fine for several years. Now, today, TBird tells me that my AOL password is incorrect. I changed the AOL password but TBird still does not work. I can sign on to AOL just fine using Chrome and going to the AOL web site, but TBird will not sign me in. Please help.

Hi there, I surfed the internet but did not find any good answer for my problem. I lost my thunderbird master password. If you want to mail me, send me via [edited email from community support forum] Thanks a lot.

As so many have experienced, but I have yet to find the actual solution, I will bring up the issue.

I recently purchased a new computer. Installed Thunderbird, created all the mail accounts I have and... no problems. All the accounts, once created, populated with emails. For 3-4 days, there were no issues.

Important to note: I let TB use all the default settings. And once everything was up and running >>>>I did not change anything<<<<<.

Then a few days later, I started getting the following messages for two accounts that had migrated from q.com to myctl.net. Entering the 100% proven-correct password results in the know endless-loop of entering the password and the same pop-up error message. The PW is 100% correct as I can go to Centurylinks' website and login using that same, exact password and read my emails.

I've spent enough time trying all the suggestions here, reddit, facebook etc so I'd thought I'd see if anyone has actually found a solution.

Thunderbird keeps opening a Google authentication window, asking which account to use. I have two gmail accounts (both of which work just fine), and another google account that I manage a calendar for (it works fine as well). How do I work out which account is seeking authentication?