Komunitné fórum Thunderbird

To ask this question, I had to sign in. But the password to sign in, which permits me to reach this page, where I can ask this question, does not give me access to my email. I have tried using my apple account password and my computer password to no avail. How do I fix this?

Hello,

I'm moving to Graph from EWS and have followed the instructions at: https://support.mozilla.org/en-US/kb/microsoft-ews-graph-migration

I get through to screen that offers Graph API as an option, alongside IMAP, POP3 etc, and click on Graph API which directs me to my browser to log in to my email service (via GoDaddy). I log in successfully which takes me to the Thunderbird 'You're All Set' screen saying the account has been securely connected to Thunderbird and therefore ok to close that screen.

Back on Thunderbird it then progresses but returns with "Authentication Error - unable to log in at server. Probably wrong configuration, username or password".

The username and password are correct, and there aren't any other options available when editing/manually configuring the connection...so at a dead end, alas.

Any pointers much appreciated!

• • Titel: Yahoo-Mail lässt sich in Thunderbird 153.5 unter macOS nicht anmelden – „Es ist ein Problem aufgetreten“**

Hallo zusammen,

ich kann mein Yahoo-Mail-Konto seit etwa zwei Wochen nicht mehr in Thunderbird einrichten. Ich vermute ein Problem mit der Yahoo-OAuth2-Anmeldung.

• • Mein System:**

- Betriebssystem: macOS auf einem MacBook Pro - Thunderbird-Version: 153.5 - Weitere E-Mail-Konten in Thunderbird: Gmail, WEB.DE, GMX und Host Europe. Diese funktionieren alle problemlos.

• • Fehlerbeschreibung:**

Wenn ich mein Yahoo-Konto hinzufügen möchte, öffnet sich das Yahoo-Anmeldefenster. Ich gebe meine vollständige Yahoo-E-Mail-Adresse und mein korrektes Passwort ein. Anschließend erscheint folgende Fehlermeldung:

„Es ist ein Problem aufgetreten. Wir konnten Sie nicht anmelden. Versuchen Sie es bitte auf einem anderen Gerät.“

Darunter befindet sich ein lila Button „Hilfe aufrufen“.

Die Anmeldung bei Yahoo funktioniert dagegen problemlos über Firefox auf demselben Mac mit demselben Passwort. Auch die Anmeldung über meinen Passkey auf dem iPhone funktioniert.

• • Bereits durchgeführte Maßnahmen:**

- Yahoo-Passwort geändert und die Anmeldung über Firefox erfolgreich getestet. - Zwei-Faktor-Authentifizierung bei Yahoo aktiviert. - Yahoo-Konto in Thunderbird gelöscht und mehrfach versucht, es neu einzurichten. - Authentifizierungsmethode für IMAP und SMTP überprüft: OAuth2. - Cookies und JavaScript in Thunderbird aktiviert. - Im Konfigurationseditor folgende Werte überprüft:

 - `mailnews.oauth.usePrivateBrowser = true`
 - `mailnews.oauth.useExternalBrowser = false`
 - `javascript.enabled = true`

- Ein Yahoo-App-Passwort erstellt und versucht, das Konto manuell mit „Passwort, normal“ einzurichten. Thunderbird öffnet trotzdem wieder das Yahoo-Anmeldefenster unter `autodiscover.yahoo.com`, wo dieselbe Fehlermeldung erscheint. - Alte Yahoo-Einträge aus dem Passwortspeicher entfernt. - Doppelte Yahoo-SMTP-Einträge gefunden und den veralteten Eintrag entfernt. - Thunderbird vollständig beendet und neu gestartet.

Nach dem Neustart erscheint teilweise sogar eine Passwortabfrage für `peterbeck127@yahoo.com`, obwohl das Yahoo-Konto nicht mehr in der Kontenliste vorhanden ist.

• • Meine Fragen:**

1. Ist ein bekannter Fehler bei der Yahoo-OAuth2-/PKCE-Anmeldung in Thunderbird 153.5 vorhanden? 2. Warum lehnt Yahoo die Anmeldung in Thunderbird ab, obwohl dieselben Zugangsdaten über Firefox funktionieren? 3. Wie kann ich eventuell verbliebene Yahoo-Anmeldeversuche oder Servereinträge vollständig entfernen, ohne mein Thunderbird-Profil und meine anderen E-Mail-Konten zu beschädigen? 4. Gibt es einen bekannten Workaround oder eine Korrektur für dieses Problem?

Ich möchte mein Yahoo-Konto wieder normal über IMAP und SMTP in Thunderbird verwenden können, ohne meine anderen Konten neu einrichten zu müssen.

Vielen Dank für eure Hilfe!

Have got a replacement computer, and downloaded the latest TBird (having used it with AOL) for years). Following initial set up procedure, TB detects correct settings for AOL and the "enter password" page opens from AOL succcessfully for authorisation. AOL requires 2 factor authorisation, and I use a phone code for this.

However the speed at which the code arrives from AOL has always varied quite a bit, and today it is taking almost a minute so the TB set up screen is timing out long before the code arrives. Cant go on retrying as I will get locked out of the account. No point in going for manual set up as the auto settings are correct, so the same problem is going to occur. I have three AOL e-mail addresses to set up! Is there a workaround of some sort for this - its terribly frustrating and the set up screen "connect your e-mail settings" timeout period does seem quite short if you have to wait for a 2FA phone code or e-mail code - any delay in the arrival of which is completely ouside your control . Dave

I am using the correct password but it keeps saying " Login to server imap.comcast.net with username [redacted]@comcast.net failed.". I hope someone can help. Thanks.

I am trying to add a new Outlook.com email account to Mozilla Thunderbird on Windows, using IMAP with OAuth2 authentication.

The account works correctly through Outlook.com webmail, but Thunderbird repeatedly fails to complete authentication.

I have tried the following:

1. Configured the account using IMAP with OAuth2 authentication.

2. Checked the incoming and outgoing server settings.

3. Attempted to add the account several times.

4. Checked the POP and IMAP settings in Outlook.com webmail.

5. Tried using a separate Thunderbird profile to investigate the problem.

Thunderbird does not successfully authenticate the account, preventing me from adding it.

I already have existing email accounts in Thunderbird, including an ntlworld.com account and a Hotmail account configured using POP.

My intention is to migrate my existing ntlworld.com emails and folders to the new Outlook.com account using IMAP.

Could someone please advise why OAuth2 authentication is failing and what settings or troubleshooting steps are required to resolve this?

I would particularly appreciate guidance that will not interfere with my existing Thunderbird accounts or stored emails.

I have read the topic "Microsoft EWS to Graph Migration October 2026". I have followed the instructions meticulously MULTIPLE TIMES. Unfortunately for me, it DOES NOT WORK!! After deleting the EWS account, I proceed to create the new Graph account, but it fails (has failed) EACH AND EVERY TIME I've tried it. I finally had to give up, and restore/re-install/setup the Thunderbird EWS version. The failure reported on each failure was an "authentication failure".

My OS is macOS Tahoe 26.7.1; My Thunderbird version is 158.0. This is distressing! If there is an issue, I would expect T'bird to belay the update until the issues were fixed. If there is a "trick" required, I would appreciate someone sharing it with me. I'm aware that the causes of these issues is "Microsoft Incompetence", but AFAIK incompetence is not "contagious" - I don't understand T'bird/Mozilla releasing a fix with detailed procedures without testing.

EDIT: One other piece of information that may or may not be useful. The article "Microsoft EWS to Graph Migration October 2026" mentions a "Microsoft 365/Exchange Online email account". My account is an "Exchange Server" account; the Exchange server is hosted by Microsoft.

Thanks for any advice.

Best Regards, ~JM

Since Friday I have not been able to use thunderbird. I can open it but it wont connect to Virgin.com I have checked all settings (click on test connection it states good) then every five minutes when it try's to connect I get the following message (email address removed)

Login to server pop3.virginmedia.com with username ******* failed

I still get mail on my phone so it's down to a Thunderbird issue I believe. Tried to reinstall same issue, tried a new account and wont allow me to authenticate.

PLEASE can someone help - have a load of work to do but can't get on. Thanks in advance David.

When I open Thunderbird to my ninja@globalnet.co.uk account it will not sign in and is asking for a new password. When I enter the old password it fails to recognise it when I enter a new password it will not let me log in. Therefore I can not access anything in Thunderbird on my ninja@globalnet.co.uk account. Please send any reply to 52bland@gmail.com.

I deleted one of my emails accounts because it was hacked; I logged in to Ionos (hosting my email) and had to change my password; I changed the password but now I can't reinstall it; Authentication failed; FYI when I use the webmail using the new password, I can check my emails. Please help; Thank you.

Title: Thunderbird 158 – Outlook.pt (IMAP, OAuth2): Microsoft login page never loads, authentication error

Hello,

I can't connect a personal Outlook.pt account (outlook.com) to Thunderbird. The Microsoft sign-in page never appears and I get "Authentication failed".

Environment - Thunderbird 158.0 (64-bit), also tested on Beta; Windows 11 - Browsers installed: Brave and Chrome (Chrome set as default for testing) - Account: personal @outlook.pt, no Microsoft 365 subscription

Settings used - IMAP: outlook.office365.com, port 993, SSL/TLS, OAuth2 - SMTP: smtp.office365.com, port 587, STARTTLS, OAuth2 - Username: full email address

What I have tried - Account setup test says "secure connection to outlook.office365.com:993 established successfully". - Automatic setup: no login window opens; the Error Console shows GuessConfig trying SMTP on port 465 (NS_ERROR_ABORT) and then "authentication failed". - Manual setup with OAuth2 forced: a browser window opens, but it stays on the browser's start page. Once, instead of Microsoft, it showed a Google consent page ("Mozilla Thunderbird Email wants to access your Google Account") for a Gmail address I use elsewhere, even though I was adding the Outlook account. - Clicking links inside emails correctly opens the browser, so the default-browser association works. - Cleared saved passwords/OAuth entries for outlook/office365/microsoft; removed and re-created the account several times. - Created a brand-new clean profile: same result. Thunderbird Beta: same result. - Microsoft account "recent activity" shows no sign-in attempt, so the request seems not to reach Microsoft. - Main profile has extensions (LanguageTool, flagged as incompatible, and CardBook). Not yet tested in Troubleshoot Mode. - Error Console shows no OAuth-related errors besides the GuessConfig lines above.

Questions - Why would Thunderbird open a Google consent page when adding an Outlook account? - Is there a known issue with OAuth2 for Outlook.com in version 158, or a hidden setting that could cause this?

Troubleshooting information from about:support is pasted below. Thank you.

Trying to set up new Gmail account in Thunderbird. New account dialog opens, recognises Gmail address and imap details, but doesn't allow me to provide Gmail with password. Authentification failure results.

I had to change my Google password and I cannot get to my mail. I tried to uninstall/reinstall Thunderbird with no joy. When I try to open Thunderbird, Google responds: "The server cannot process the request because it is malformed. It should not be retried. That is all we know."

I am using Thunderbird 158.0 (64-bit) on Windows 11 and cannot connect a newly created Outlook.com email account.

The account works correctly through Outlook.com webmail, but Thunderbird consistently reports:

"Authentication error — Unable to log in at server. Probably wrong configuration, username or password."

I have spent considerable time troubleshooting this problem and have already completed the following checks:

Confirmed that IMAP access is enabled in Outlook.com.

Verified incoming IMAP settings:

Server: outlook.office365.com

Port: 993

Security: SSL/TLS

Authentication: OAuth2

Verified outgoing SMTP settings:

Server: smtp-mail.outlook.com

Port: 587

Security: STARTTLS

Authentication: OAuth2

Confirmed both usernames are my full new Outlook.com email address.

Confirmed that Microsoft lists "Mozilla Thunderbird" as an authorised application, with permission to read, write and send email.

Tested network connectivity using Windows PowerShell. Test-NetConnection outlook.office365.com -Port 993 returned TcpTestSucceeded : True.

Created a completely new Thunderbird profile containing only this Outlook.com account. The same authentication error occurred.

Tested Thunderbird Troubleshoot Mode without success.

Confirmed cookies are enabled and Windows is not using a manually configured proxy.

Removed saved OAuth2 credentials and retried authentication, without success.

Tested both external-browser and internal-browser OAuth2 authentication using mailnews.oauth.useExternalBrowser. Neither worked, and I restored the original value of true.

During an earlier attempt, the Microsoft authentication process displayed the error 127.0.0.1 refused to connect.

Microsoft's authorised applications page confirms Thunderbird has the necessary permissions, but Thunderbird still cannot authenticate. I have not successfully been prompted to enter my new Outlook.com account password through Thunderbird.

My existing Hotmail account works in Thunderbird.

Could this be a known Thunderbird 158 OAuth2 problem affecting newly created Outlook.com accounts?

As the usual configuration, password, permissions and network checks have already been completed, I would appreciate advice on identifying the underlying authentication failure rather than repeating those steps.

Thank you for your assistance.

I have multiple email accounts on Thunderbird (on MX Linux)... att.net, gmail.com and aol.com

While traveling without my computer, i had to reset my aol password on my iphone.

Now that I'm back at my desk, and being unable to find how to change the aol password on Thunderbird, I deleted the AOL imap account and have tried much of today to add a new AOL account.

In the past, I could create an 'app password' within AOL (browser) and use that password in Thunderbird... but that is no longer working.

Any guidance/suggestions?

I am running the latest Thunderbird version 140.17.0esr (64-bit) available in my MX Linux.

Been away for 1 week, and not used Thunderbird during absence. On return logged in as usual on desktop and cannot retrieve or send messages on Thunderbird - message asks for webmail password, which it has not done for many years, then will open inbox but only shows all mail up to the day I last shutdown the system (7 Oct), then continues to ask for password for host. Have tried editing password within settings (but it is correct anyway) and can separately log into webmail (using the same password). Essentially unable to use Thunderbird but unwilling to use email history and using the webmail interface (plusnet) is slow and unwieldy. Any ideas much appreciated! I also note that my Thunderbird version must have updated automatically on opening to the latest version -158. Could this be the problem?