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Hi, I keep getting a login to account failure error message. It reads "Login to account "xxx@xxx" failed. Login to server mail.xxx with username xxx@xxx failed." This issue is occurring on an iMac. The same login credentials work on my Thunderbird Macbook Air. The support at Siteground were unable to resolve the issue, except to say, after a successful test at their end, that the problem must be with Thunderbird. The version I'm using is 152.0 (aarch 64). I've tried a quit and re-install more than once. Can you help?

I'm being notified that I have to give a password for a mail from an unknown sender. Giving my Mozilla password doesn't help. How do I solve this because it is a recurring request which is very annoying .

Recently, whenever I open Thunderbird, a sign in pop up screen appears. When I enter to proceed, the next page comes up with error 400 bad request? If I ignore this and close the boxes, I can use Tbird without any issues, but, it is a nuisance dealing with this error message every time I use Tbird. How do I resolve this?

I update Thunderbird/linux to v.130 over a year ago, implementing oath2 with gmail. I do NOT want to do more updates because with each previous update I lose desired capabilities; I did this update only because of gmail's authorization requirements.

Worked fine for a while and then I started getting "authorization error" messages and could no longer access this account with Thunderbird. I have over 20gb of stored messages on my computer and do not want to do anything that will jeopardize this -- I generally delete all messages at the server. Google is of no help other than suggesting deleting and then somehow restarting the account. No. Someone suggested switching the account from oauth2 to password and then switching back again, but I am reluctant to do anything that might lose my messages. I can backup the entire profile, of course, but that just gets me back to where I was.

I went through the reauthorization process with gmail, including getting the 6-digit code, but the error still exists. I've been forwarding mail in this account to another account, but I'd rather go back to the REAL account. Help!

I am trying to migrate my Thunderbird account from PC Windows 10 to a new PC Windows 11. The installation selects my provider and settings correctly but when I try and sign in, I get the above message. I have not the first idea where to start there. any help would be appreciated. I still have a copy on a windows 11 laptop that I can use to enter settings, but I can't get that far with the installation. Any help would be greatly appreciated.

Since 2 days ago, Thunderbird has been asking me to authenticate each of my email accounts. I had done them twice already, but if I have to do it each day, Thunderbird becomes useless to me. How do I resolve the issue? Thanks!

I can't log into an email from my health site called MyMercy to get lab reports, etc., using Firefox; Have to switch to Google Chrome to do it. Is Firefox aware of this issue? Please respond [edited email from community support forum]

I have used Thunderbird for years but mid windows 10 I started having this problem I have all my user name & Password in a note pad for all places I go to.I'm on Winddows11 home.Also I can't sign in so I can;t Tell you what Version I have.

I'm being threatened by email with closure of my account unless I sign in by clicking a button in the message. As far as I can tell, I am signed in. So these emails are fraudulent?

Hi, I have multiple email accounts. To access the passwords there is now a prompt asking for an email and password- some 'identity'.

How do I know/guess what that might be?

v128.14

Thanks David Lawrie

I can't add my Yahoo Mail account because of an authentication error.

The following message is displayed: "Authentication error Can't sign in to the server. Please check your username, password, and settings."

The authentication method "OAuth2" does not appear.

I can sign in and receive mail with the same ID and password in a web browser.

Thank you for your help.

Hi all! I'm having an issue with Thunderbird in conjunction with my Outlook account.

I used to be able to add my account just fine (using OAuth2). But for a few months now, I have been getting "Authentication failed" errors (see first picture).

It used to be that I could temporarily remedy this by signing out and back in. Today, however, I was unable to sign back in, using the stock settings for Outlook (see second - fourth picture). No authentication popup appeared.

I was sporadically able to add the account and get messages to start appearing by clicking on "Edit configuration" and removing and re-adding the hostname for the IMAP server, without an authentication popup appearing. I therefore suspected that there might be some half-stale credentials stuck in the cache, and there probably were, because after clearing my cache this method doesn't work anymore. I am still not getting any authentication popup though.

All the usual suspects I already tried: Thunderbird is up-to-date (151.0.1), my Outlook account definitely has IMAP and SMTP activated, and another mail account (gmail) works without a hitch on the same system.

I hope that someone can help me, as I'm at my wit's end. Thanks in advance!

I have a new computer and I am loading my email accounts into TB. One of them loaded perfectly but the outlook account has been trouble. I have read several forum questions/answers and tried all of the suggestions with no help. I will attach a screen print of the page I get when prompted to enter password credentials. I cannot go further until I can get TB and Outlook to communicate so I need help. I don't want to use Outlook as an email server if possible.

Thunderbird 148+ on Windows 11 repeatedly prompts for the password when synchronizing an Exchange account (professional) configured with the native Exchange support (no add-on installed).

The account only offers “NTLM” or “Normal password” authentication methods. OAuth2 is not available in the account settings.

During synchronization, Thunderbird asks for the password separately for many folders. However, clicking “Retry” usually works immediately without changing the password, and manually re-entering the same password also works.

The issue then reappears for the next folder, causing continuous authentication prompts (I have many folders...).

Actions already tested:

• deleting saved passwords and tokens,
• deleting/renaming key4.db and logins.json,
• restarting Thunderbird,
• recreating the account.

The problem persists.

This looks like an authentication/session handling issue rather than an actual invalid password.