Thunderbird IMAP responded: User is authenticated but not connected

Anonymous
2022-12-27T12:29:12+00:00

Since yesterday, my Thunderbird client cannot connect to the outlook.office365.com IMAP server and other users at my university are also having this problem. I have deleted the stored token and redone the connection procedure but it does not work. I get two error messages:

The current operation on 'inbox' did not succeed. The mail server for account ... (IMAP) responded: User is authenticated but not connected.

Server outlook.office365.com has disconnected. The server may have gone down or there may be a network problem.

This does not work on any platform: Windows, Linux or Macos. Via the browser, we can access the emails but it is a workaround because it does not support openPGP. We need Thunderbird

Outlook | Web | Outlook.com | Account management, security, and privacy

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Anonymous
2022-12-28T22:03:29+00:00

Hi Glenn,

Which version of Thunderbird are you using.

I have 102.6.1 which is the latest one. Can you try updating it if its not and then check.

Also under Thunderbird --> Click on the gear icon on the bottom left bar --> General --> Config Editor --> Show All

Type network.dns.dis in the search field

Select the very first option and click on the toggle arrow on the right, make it true

Close and reopen Thunderbird.. See if this helps

Let me know how it goes

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Anonymous
2022-12-28T21:34:14+00:00

Yes, it is worked for me too!

I just disabled ipv6 netwotking in thunderbird advanced configuration editor (network.dns.disableIPv6 = true)

and it is works again like a charm!

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  1. Anonymous
    2023-01-07T22:37:50+00:00

    Leider hat auch diese Anleitung (Sent items reparieren) keine Besserung gebracht

    Can you provide the configuration for your sent email copy?

    Können Sie die Konfiguration für Ihre gesendete E-Mail-Kopie bereitstellen?

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  2. Anonymous
    2023-01-07T19:39:18+00:00

    Leider hat auch diese Anleitung (Sent items reparieren) keine Besserung gebracht

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  3. Anonymous
    2023-01-06T09:49:48+00:00

    Thank you for your answer. I get the following error message in german:

    Die Nachricht wurde gesendet, aber es wurde keine Kopie im Gesendet-Ordner (Sent Items) gespeichert, da es zu Problemen bei dem Zugriff auf Netzwerk oder Dateien kam.Sie können es erneut versuchen oder die Nachricht lokal unter Lokale Ordner/Sent *** Email address is removed for privacy *** speichern.

    The error means that Thunderbird cannot save a copy of a sent mail message and is giving you the option to save a copy of the message to a local folder. I have seen that error message before and it can have several causes. This error might be unrelated to the IPv6 error.

    Der Fehler bedeutet, dass Thunderbird keine Kopie einer gesendeten E-Mail-Nachricht speichern kann und Ihnen die Möglichkeit gibt, eine Kopie der Nachricht in einem lokalen Ordner zu speichern. Ich habe diese Fehlermeldung schon einmal gesehen und sie kann mehrere Ursachen haben. Dieser Fehler hat möglicherweise nichts mit dem IPv6-Fehler zu tun.

    https://support.mozilla.org/en-US/questions/1299140

    Try to repair your sent email folder:

    Versuchen Sie, Ihren gesendeten E-Mail-Ordner zu reparieren:

    1. Klicken Sie mit der rechten Maustaste auf den Ordner für gesendete E-Mails (right click on SENT email folder)
    2. Eigenschaften (properties)
    3. Allgemein (general)
    4. Reparieren (Repair)

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