Hotmail personal account: IMAP OAuth2 works but SMTP OAuth2 fails with message: 535 5.7.139 “SmtpClientAuthentication is disabled for the Mailbox”

I am assisting an elderly user with a personal @hotmail.com account that receives email successfully in Thunderbird but cannot send. I have confirmed they can send and re… (les mer)

I am assisting an elderly user with a personal @hotmail.com account that receives email successfully in Thunderbird but cannot send. I have confirmed they can send and receive emails from their online outlook.com portal. The user's computer setup is as follows:

  • Windows 11 (with latest updates).
  • Thunderbird 153.0.2 (64-bit).
  • A personal @hotmail.com account with the following server configurations:
  -> Incoming IMAP: outlook.office365.com, port 993, SSL/TLS, OAuth2, and
  -> Outgoing SMTP: smtp-mail.outlook.com, port 587, STARTTLS, OAuth2.

Thunderbird successfully authenticates to Microsoft using OAuth2 for incoming email. However, when Thunderbird attempts outgoing email authentication, Microsoft's SMTP server rejects the authentication. The Error Console in Thunderbird records this message: "535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Mailbox."

-> Refer to attached image: "Thunderbird Error Console_20260811.jpg". -> I am able to provide a short screen recording demonstrating the failure if needed.

To try and resolve the above, I completed the following actions:

  1. Confirmed Thunderbird is current (153.0.2).
  2. Confirmed SMTP is configured for OAuth2 rather than Normal Password.
  3. Confirmed port 587 and STARTTLS.
  4. Re-authorised the Microsoft account/OAuth connection.
  5. Confirmed IMAP OAuth2 works.
  6. Confirmed Outlook.com webmail can send successfully.
  7. Reviewed Mozilla's current “Microsoft OAuth Authentication and Thunderbird in 2026” guidance, including the section covering cases where IMAP/POP works but SMTP does not.
  8. Captured the SMTP failure in Thunderbird's Error Console.

However nothing worked, so I raised the matter with Microsoft support and eventually had the matter referred to their Tier 2 team. The Microsoft case number is: 7107041963.

Microsoft Support confirmed that for a personal Outlook.com/Hotmail account there is no user-accessible mailbox-level SMTP AUTH setting, and advised that SMTP is enabled by default for supported clients. However, because sending from Outlook.com webmail works, Microsoft Tier 2 declined to investigate the SMTP server response further and directed me to Thunderbird support.

I am able to provide a copy of the chat transcript if needed.

In any event, the TLDR version IMAP works using OAuth2, but SMTP using OAuth2 fails because Microsoft's SMTP server reports SmtpClientAuthentication is disabled for the Mailbox. Microsoft Tier 2 has referred the issue to Thunderbird support.

Questions:

  1. Is this a known current issue affecting personal Outlook.com/Hotmail accounts using Thunderbird?
  2. Is 535 5.7.139 SmtpClientAuthentication is disabled for the Mailbox known to occur with Thunderbird OAuth2 even though IMAP OAuth2 succeeds?
  3. Is there a current Thunderbird-side workaround or alternative SMTP server/configuration recommended for personal Hotmail accounts?
  4. Would changing the SMTP server from smtp-mail.outlook.com to smtp.office365.com be appropriate for a personal Hotmail account in Thunderbird 153, or should the current Microsoft-documented server be retained?

-> I note there appears to be conflicting advice on this point in previous support threads.

  1. Given that IMAP OAuth2 authentication succeeds for the same Microsoft account, does this indicate that Thunderbird's Microsoft OAuth authorisation itself is functioning correctly, or could SMTP require a separate permission/token that may be failing?
  2. Are there any additional Thunderbird logs or diagnostics I can provide that would help resolve this matter?

Disclosure: I used ChatGPT to help organise my troubleshooting notes and technical details for this post. The troubleshooting, observations and diagnostic information described above are from my own work on the affected PC.

Open 6 1 70

No longer able to receive emails

A couple of days ago I was suddenly unable to receive email. I can still "Send." This may be relevant. A week or so ago my ATT email started requiring a verification… (les mer)

A couple of days ago I was suddenly unable to receive email. I can still "Send." This may be relevant. A week or so ago my ATT email started requiring a verification process that required matching up figures. This continued for several days. Eventually I started receiving a "verification confirmed" message w/o having to match the figures and the log-in proceeded as usual. For the last couple of days I have not received the verification message and the log-in as proceeded in the normal manner. I remember a few years ago there was a problem with ATT and Thunderbird having to have a special pass word. It was called a SafeKey. Don't know if this is the same problem.

Open

Why are comments in the calendar description showing up suddenly black on black?

Suddenly, the comments in the descriptions of calendaring are showing up black writing in a black area, so I can hardly read them. Why? Was this changed in a recent updat… (les mer)

Suddenly, the comments in the descriptions of calendaring are showing up black writing in a black area, so I can hardly read them. Why? Was this changed in a recent update. If so, how can I fix it?

Open 1

Windows 11 preview update results in invalid certificate error - timezone change

Hi there. I'm in Alberta, where we have recently changed timezones. Note that the CLOCK has not changed yet, as we are still before the date in November when we would "fa… (les mer)

Hi there.

I'm in Alberta, where we have recently changed timezones. Note that the CLOCK has not changed yet, as we are still before the date in November when we would "fall back". We were UTC-6 summer and UTC-7 winter. Windows called this "Mountain Time (USA and Canada), but now the "Mountain Time (Alberta)" timezone is in Windows after the 2026-09 Preview Update (KB5124010) (26300.9550).

When connecting to Shaw.ca's IMAP servers, the certificates that were valid prior to the Windows update are now reported as invalid. This has been confirmed across two separate PCs with different email accounts. The data for the certificate LOOKS valid (see screenshot) and is the same before and after the timezone change.

The failure occurred on the latest ESR release of Thunderbird, as well as 156.0 and 157.0 non-ESR.

Thanks :)

Open 5 1 20

How to turn off warning about recipients seeing addresses so use bcc

As per title, if I have a large enough distn list I get a warning bar (see image) with The x recipients in To and Cc will see each other's address. You can avoid disclo… (les mer)

As per title, if I have a large enough distn list I get a warning bar (see image) with The x recipients in To and Cc will see each other's address. You can avoid disclosing by using Bcc instead. Then two options, which appears to require a response. ( I haven't tested not acknowledging it and sending a blank email to one of my large lists as I don't want to appear incompetent to all my work colleagues)

This helpful warning is (emotively) treating me like an idiot. I am well aware of the 3 categories and I know how to use them. I don't need to be told each time and have to choose. I don't need a warning, if I stuff up that's my problem.

The issue for me is that recently I have started to use some larger distn lists so it's occurring too frequently.

Have searched but so far missed any option or config setting to disable this. Can anyone please advise how to do so, if it is possible.

This isn't asking for a debate on whether or not it's a good idea to warn people who don't understand email sending options (you can guess my view but each to their own). I'm simply asking is there a way to turn this behaviour off and stop TB from wasting my time requiring a response.

Thanks.

Solved 2

Why are specific relay emails being sent to spam despite having a filter, and only being removed when the filter is run manualy?

I'm running the current 157.0.1 release on Windows 11, and specifically am having my emails from the AP be sent to spam even though I have a specific filter set to tag th… (les mer)

I'm running the current 157.0.1 release on Windows 11, and specifically am having my emails from the AP be sent to spam even though I have a specific filter set to tag them. I feel as if the filter itself is set up properly because when I manually run it the messages will be moved from the spam folder to the inbox and tagged accordingly.

The one thing sticking out to me is these emails are being forwarded through my relay account. I've tried changing the filter to work based on the relay address, but again it only works when I manually run it. I've also tried setting the filter to run both before "and" after spam classification, but neither option works. Ideally the filter would work without me having to go to my spam and run it, and even then I'm wondering why the spam filter hasn't learned by now that those email belong in my inbox.

I'd appreciate any help or solutions; I'm not an email power user or networking wiz though so please try to keep it as dumbed down for me as possible!

Open 8 20

Recurring Issue with Attachment Button in Thunderbird Desktop

Dear Support Team, I am facing a recurring issue with the Attachment button in the Thunderbird Desktop application for the past few days. When I click the Attachment butt… (les mer)

Dear Support Team,

I am facing a recurring issue with the Attachment button in the Thunderbird Desktop application for the past few days.

When I click the Attachment button while composing an email, it does not respond or open the file selection window. However, I am able to attach files successfully by using drag and drop.

After some troubleshooting, I found that deleting the mail.compose.attach.dir preference from the Thunderbird Config Editor resolves the issue temporarily. Once I delete this preference, the Attachment button starts working normally again.

However, after some time, the same issue reappears, and I have to repeat the process of deleting mail.compose.attach.dir from the Config Editor.

Could you please advise on a permanent solution to prevent this issue from recurring? I would appreciate it if you could also let me know whether this is a known Thunderbird issue and if there is any recommended configuration change, update, or fix available.

Thank you for your assistance.

Open 1

Unable to attach files to emails (the ‘Attachments’ button does not respond)./ Anhänge an Email nicht möglich (Button "Anhänge" reagiert nicht).

I want to attach a file to an email. However, the ‘Attach’ button isn’t responding. The help button at the bottom of the page isn’t responding either. This hasn’t been a … (les mer)

I want to attach a file to an email. However, the ‘Attach’ button isn’t responding. The help button at the bottom of the page isn’t responding either. This hasn’t been a problem before.

Ich will an eine Email eine Datei anhängen. Der Button "Abhänge" reagiert aber nicht. Auch der Hinweisbutton an der Fußleitse reagiert nicht. Bisher war dies kein Problem

Open 2 1

Thunderbird has stopped to include attachments via key. Only drag and drop function.

For years I have been attaching message files, pics., etc. by clicking the Attach button and browsing to the target. Now I have to drag and drop the attachments as the A… (les mer)

For years I have been attaching message files, pics., etc. by clicking the Attach button and browsing to the target. Now I have to drag and drop the attachments as the Attach click is useless.

Open 1

A problem with sending attachments with an email

Good morning, I am requesting assistance for a recent problem I have encountered sending attachments with email messages I am sending. There is no problem with sending t… (les mer)

Good morning,

I am requesting assistance for a recent problem I have encountered sending attachments with email messages I am sending. There is no problem with sending the message itself. And have noticed no problems with receiving messages. When I attempt to send an attachment with a message I am sending, a click on the "attach" icon in the upper right-hand corner of the email screen, provides no response. I didn't notice a problem with this function in past weeks.

I appreciate your assistance. Thank you.

Tom Macciaro

Open 1

When I

I'm running Thunderbird Version: 153.4.0esr Build-ID: 20260929234349 (more details at the end). Lsat update was on Oct.. 2nd. These days I observed a behavior of the qui… (les mer)

I'm running Thunderbird Version: 153.4.0esr Build-ID: 20260929234349 (more details at the end). Lsat update was on Oct.. 2nd. These days I observed a behavior of the quick filter, which i had not observed before: When I enable the quickfilter, but all filter options off (!) , some mails are hidden. One of the mails is unread. When I activate the option to show only unread mails, It still gets not displayed. The message only reappears when I disable quick filter again. I have cleared the start-cache, I have started in troubleshooting mode, I have deleted the global index and let thunderbird rebuiold it from scratch. No matter what I did, the error persisted. Even entering a search word i.e. Atomstrom to find the message, it did not show up.

Attached are two screen shots. one with quickfilter off, the other with quickfilter on. The Mails with the red box on screenshot with quickfilter off are missing, when quick filter is activated.

Is it a bug or a user-error?


 Allgemeine Informationen
   Name: Thunderbird
   Version: 153.4.0esr
   Build-ID: 20260929234349
   Distributions-ID:
   Update-Kanal: esr
   User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:153.0) Gecko/20100101 Thunderbird/153.4.0
   Betriebssystem: Windows_NT 10.0 26300
   Betriebssystem-Theme:
   Starter-Prozess: Aktiviert
   Fenster mit mehreren Prozessen: 0/0
   Fission-Fenster: 0/0
             Standardmäßig aktiviert
   Externe Prozesse: 3
   Unternehmensrichtlinien: Inaktiv
   Google-Location-Service-Schlüssel: Gefunden
   Google-Safebrowsing-Schlüssel: Fehlt
   Mozilla-Location-Service-Schlüssel: Fehlt
   Abgesicherter Modus: false
   Speichergröße (RAM): 14,8 GB
   Speicherplatz verfügbar: 47,7 GB
 E-Mail- und Newsgruppen-Konten
   account1:
     INCOMING: account1, , (pop3) pop.gmx.net:995, SSL, 3
     OUTGOING: , mail.gmx.net:465, SSL, 3, true
     OUTGOING: , posteo.de:587, 2, 3, false
   account2:
     INCOMING: account2, , (none) Local Folders, 0, 3
   account6:
     INCOMING: account6, , (pop3) securepop.t-online.de:10997, 0, 3
     OUTGOING: , 127.0.0.1:10467, 0, 3, true
   account7:
     INCOMING: account7, , (pop3) pop.1und1.de:11995, SSL, 3
     OUTGOING: , smtp.1und1.de:465, SSL, 3, true
   account10:
     INCOMING: account10, , (imap) imap.1und1.de:993, SSL, 3
     OUTGOING: , smtp.1und1.de:465, SSL, 3, true
   account14:
     INCOMING: account14, , (imap) mail.verdigado.net:993, SSL, 3
     OUTGOING: , mail.verdigado.net:465, SSL, 3, true
     OUTGOING: , mail.verdigado.net:465, SSL, 3, false
     OUTGOING: , mail.verdigado.net:465, SSL, 3, false
     OUTGOING: , mail.verdigado.net:465, SSL, 3, false
     OUTGOING: , mail.verdigado.net:465, SSL, 3, false
     OUTGOING: , mail.verdigado.net:465, SSL, 3, false
     OUTGOING: , mail.verdigado.net:465, SSL, 3, false
   account16:
     INCOMING: account16, , (imap) posteo.de:993, SSL, 3
     OUTGOING: , posteo.de:587, 2, 3, true
     OUTGOING: , posteo.de:587, 2, 3, false
     OUTGOING: , posteo.de:587, 2, 3, false
     OUTGOING: , posteo.de:587, 2, 3, false
   account18:
     INCOMING: account18, , (imap) imap.web.de:993, SSL, 3
     OUTGOING: , smtp.web.de:587, 2, 3, true
     OUTGOING: , smtp.web.de:587, 2, 3, false
     OUTGOING: , smtp.web.de:587, 2, 3, false
   account22:
     INCOMING: account22, , (rss) Feeds, 0, 3
   account28:
     INCOMING: account28, , (imap) imap.strato.de:993, SSL, 3
     OUTGOING: , smtp.strato.de:465, SSL, 4, true
   account30:
     INCOMING: account30, , (imap) secureimap.t-online.de:993, SSL, 3
     OUTGOING: , securesmtp.t-online.de:465, SSL, 3, true
   account33:
     INCOMING: account33, , (rss) Feeds-3, 0, 3
   account35:
     INCOMING: account35, , (imap) imap.gmx.net:993, SSL, 3
     OUTGOING: , mail.gmx.net:587, 2, 3, true
   account36:
     INCOMING: account36, , (imap) imap.gmail.com:993, SSL, 10
     OUTGOING: , smtp.gmail.com:465, SSL, 10, true
   account37:
     INCOMING: account37, , (imap) web313.dogado.net:993, SSL, 3
     OUTGOING: , web313.dogado.net:465, SSL, 3, true
   account38:
     INCOMING: account38, , (imap) posteo.de:993, SSL, 3
     OUTGOING: , posteo.de:465, SSL, 3, true
 Bibliotheken
     Bibliothek
     Status
     Minimal vorausgesetzte Version
     Verwendete Version
     Pfad
       RNP (OpenPGP)
       OK
       0.18.1
       0.18.1.MZLA.153.4.0esr.botan.3.11.1
       C:\Program Files\Mozilla Thunderbird\rnp.dll
       OTR
       Laden fehlgeschlagen. Die OTR-Chatverschlüsselung wird nicht funktionieren.
       -
       -
       -
 Kalender-Einstellungen
     ..............
       Name
       Wert
       Name:
       Typ: caldav
       Deaktiviert: false
       Benutzername:
       URI:
       Aktualisierungsintervall: 30
       Schreibgeschützt: false
       Erinnerungen deaktivieren: false
       Cache aktiviert: true
       iMIP-Identität: id3
       iMIP deaktiviert:
       iMIP-Konto:
       Organisator-ID:
       Terminmitteilungen per E-Mail senden:
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
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       Cache aktiviert: true
       iMIP-Identität: id3
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       iMIP-Konto:
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       Terminmitteilungen per E-Mail senden: false
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       iMIP-Identität: id3
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       iMIP-Konto:
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       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
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       Priorität unterstützt:
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       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
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       Priorität unterstützt:
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     Google basic
       Name
       Wert
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       Typ: ics
       Deaktiviert: false
       Benutzername:
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       Schreibgeschützt: false
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       iMIP-Identität: id3
       iMIP deaktiviert:
       iMIP-Konto:
       Organisator-ID:
       Terminmitteilungen per E-Mail senden:
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
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       Priorität unterstützt:
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       Automatische Terminmitteilungen unterstützt:
      ...........
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       Cache aktiviert: false
       iMIP-Identität: id12
       iMIP deaktiviert:
       iMIP-Konto:
       Organisator-ID:
       Terminmitteilungen per E-Mail senden:
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
       Privatsphäre-Status unterstützt:
       Priorität unterstützt:
       Termin unterstützt:
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       UTC/GMT unterstützt:
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       Aktualisierungsintervall: 0
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       iMIP-Identität: id12
       iMIP deaktiviert:
       iMIP-Konto:
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       Terminmitteilungen per E-Mail senden:
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
       Privatsphäre-Status unterstützt:
       Priorität unterstützt:
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     ferien_BW_2024
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       iMIP-Identität: id3
       iMIP deaktiviert:
       iMIP-Konto:
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       Terminmitteilungen per E-Mail senden:
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
       Privatsphäre-Status unterstützt:
       Priorität unterstützt:
       Termin unterstützt:
       Aufgabe unterstützt:
       Lokale Zeit unterstützt:
       UTC/GMT unterstützt:
       Automatische Terminmitteilungen unterstützt:
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       iMIP-Identität: id1
       iMIP deaktiviert:
       iMIP-Konto:
       Organisator-ID:
       Terminmitteilungen per E-Mail senden:
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
       Privatsphäre-Status unterstützt:
       Priorität unterstützt: true
       Termin unterstützt:
       Aufgabe unterstützt:
       Lokale Zeit unterstützt:
       UTC/GMT unterstützt:
       Automatische Terminmitteilungen unterstützt:
     ..........................
       Name
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       iMIP deaktiviert:
       iMIP-Konto:
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       Terminmitteilungen per E-Mail senden:
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
       Anhang unterstützt:
       Maximale Anzahl an Kategorien:
       Privatsphäre-Status unterstützt:
       Priorität unterstützt:
       Termin unterstützt:
       Aufgabe unterstützt:
       Lokale Zeit unterstützt:
       UTC/GMT unterstützt:
       Automatische Terminmitteilungen unterstützt:
     .................
       Name
       Wert
       Name:
       Typ: caldav
       Deaktiviert: false
       Benutzername:
       URI:
       Aktualisierungsintervall: 30
       Schreibgeschützt: false
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       Cache aktiviert: true
       iMIP-Identität: id3
       iMIP deaktiviert:
       iMIP-Konto:
       Organisator-ID:
       Terminmitteilungen per E-Mail senden: false
       Popup-Erinnerungen unterstützt:
       Erinnerungen für Einladung unterstützt:
       Maximale Erinnerungen für Termin:
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     WebGL-2-Treiber: Erweiterungen: GL_AMD_performance_monitor GL_ANGLE_base_vertex_base_instance GL_ANGLE_base_vertex_base_instance_shader_builtin GL_ANGLE_client_arrays GL_ANGLE_copy_texture_3d GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_get_serialized_context_string GL_ANGLE_get_tex_level_parameter GL_ANGLE_instanced_arrays GL_ANGLE_lossy_etc_decode GL_ANGLE_memory_size GL_ANGLE_multi_draw GL_ANGLE_multiview_multisample GL_ANGLE_pack_reverse_row_order GL_ANGLE_program_cache_control GL_ANGLE_provoking_vertex GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_multisample GL_ANGLE_texture_usage GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_copy_compressed_texture GL_CHROMIUM_copy_texture GL_CHROMIUM_lose_context GL_CHROMIUM_sync_query GL_EXT_EGL_image_external_wrap_modes GL_EXT_base_instance GL_EXT_blend_func_extended GL_EXT_blend_minmax GL_EXT_clip_control GL_EXT_color_buffer_float GL_EXT_color_buffer_half_float GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_draw_buffers_indexed GL_EXT_draw_elements_base_vertex GL_EXT_float_blend GL_EXT_frag_depth GL_EXT_instanced_arrays GL_EXT_map_buffer_range GL_EXT_multi_draw_indirect GL_EXT_multisampled_render_to_texture GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_shader_texture_lod GL_EXT_texture_compression_bptc GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc_srgb GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_norm16 GL_EXT_texture_rg GL_EXT_texture_storage GL_EXT_texture_type_2_10_10_10_REV GL_EXT_unpack_subimage GL_KHR_debug GL_KHR_parallel_shader_compile GL_KHR_robust_buffer_access_behavior GL_NV_EGL_stream_consumer_external GL_NV_fence GL_NV_framebuffer_blit GL_NV_pack_subimage GL_NV_pixel_buffer_object GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_image_external_essl3 GL_OES_compressed_EAC_R11_signed_texture GL_OES_compressed_EAC_R11_unsigned_texture GL_OES_compressed_EAC_RG11_signed_texture GL_OES_compressed_EAC_RG11_unsigned_texture GL_OES_compressed_ETC2_RGB8_texture GL_OES_compressed_ETC2_RGBA8_texture GL_OES_compressed_ETC2_punchthroughA_RGBA8_texture GL_OES_compressed_ETC2_punchthroughA_sRGB8_alpha_texture GL_OES_compressed_ETC2_sRGB8_alpha8_texture GL_OES_compressed_ETC2_sRGB8_texture GL_OES_depth24 GL_OES_depth32 GL_OES_draw_buffers_indexed GL_OES_draw_elements_base_vertex GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_border_clamp GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_texture_stencil8 GL_OES_vertex_array_object GL_OVR_multiview GL_OVR_multiview2 GL_WEBGL_video_texture
     WebGL-2-Erweiterungen: EXT_color_buffer_float EXT_float_blend EXT_texture_compression_bptc EXT_texture_compression_rgtc EXT_texture_filter_anisotropic MOZ_debug OES_draw_buffers_indexed OES_texture_float_linear OVR_multiview2 WEBGL_compressed_texture_s3tc WEBGL_compressed_texture_s3tc_srgb WEBGL_debug_renderer_info WEBGL_debug_shaders WEBGL_lose_context WEBGL_provoking_vertex
     Anvisierte Bildwiederholfrequenz (Framerate): 60
     DirectWrite: true (10.0.26100.9444)
     GPU 1
     Aktiv: Ja
     Beschreibung: AMD Radeon(TM) Graphics
     Herstellerkennung: 0x1002
     Gerätekennung: 0x1681
     Treiber-Version: 32.0.21037.3009
     Treiber-Datum: 5-14-2026
     Treiber: amdxc64 amdxc32 amdxn64 amdxx64 amdxn32 amdxx32 atiumdva atiumd6a
     Subsys-ID: 50b417aa
     RAM: 1024
     GPU 2
     Aktiv: Nein
     RAM: 0
     Weitere Informationen
     AzureCanvasBackend: skia
     AzureCanvasBackend (UI Process): skia
     AzureContentBackend: skia
     AzureContentBackend (UI Process): skia
     AzureFallbackCanvasBackend (UI Process): skia
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     Display0: 1920x1200@60Hz scales:1.000000|1.500000 SDR
     DisplayCount: 1
     HardwareStretching: both=1 window-only=0 full-screen-only=0 none=0 error=0
     OutputColorSpaces: DXGI_COLOR_SPACE_RGB_FULL_G22_NONE_P709
     OverlaySupport: NV12=Scaling YUV2=None BGRA8=Software RGB10A2=Scaling RGBA16F=Scaling VpSR=Not Supported VpAutoHDR=Not Supported HwOverlayHDR=Supported
     SwapChainTearingSupport: Supported
     GPUProcessPid: 18516
     Gerät-Pixel-Verhältnisse (Device Pixel Ratios) des Fensters: 1.5
     ClearType-Parameter: Gamma: 1.8 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50
     Debug-Informationen zur Sichtbarkeit von Schriftarten: Windows Platform
     WebGPU-Standardadapter: [object Object]
     WebGPU-Rückfalladapter: [object Object]
     Entscheidungsprotokoll
     HW_COMPOSITING: available by default
     D3D11_COMPOSITING: available by default
     D3D11_HW_ANGLE: available by default
     GPU_PROCESS: available by default
     WEBRENDER: available by default
     WEBRENDER_COMPOSITOR: available by default
     WEBRENDER_PARTIAL: available by default
     WEBRENDER_SHADER_CACHE: available by default
     WEBRENDER_OPTIMIZED_SHADERS: available by default
     WEBRENDER_ANGLE: available by default
     WEBRENDER_DCOMP_PRESENT: available by default
     WEBRENDER_SCISSORED_CACHE_CLEARS: available by default
     WEBGPU: available by default
     WINDOW_OCCLUSION: available by default
     HARDWARE_VIDEO_DECODING: available by default
     HARDWARE_VIDEO_DECODING_VULKAN: available by defaultdisabled by user: User disabled via media.hardware-video-decoding-vulkan.enabled
     HARDWARE_VIDEO_ENCODING: available by default
     VIDEO_HARDWARE_OVERLAY: available by default
     VIDEO_SOFTWARE_OVERLAY: available by default
     HW_DECODED_VIDEO_ZERO_COPY: available by default
     VP8_HW_DECODE: available by default
     VP9_HW_DECODE: available by default
     REUSE_DECODER_DEVICE: available by default
     BACKDROP_FILTER: available by default
     CANVAS_RENDERER_THREAD: available by default
     ACCELERATED_CANVAS2D: available by default
     H264_HW_DECODE: available by default
     AV1_HW_DECODE: available by default
     HEVC_HW_DECODE: available by default
     VP8_HW_ENCODE: available by default
     VP9_HW_ENCODE: available by default
     H264_HW_ENCODE: available by default
     AV1_HW_ENCODE: available by default
     HEVC_HW_ENCODE: available by default
     GL_NORM16_TEXTURES: available by default
     WEBGPU_EXTERNAL_TEXTURE: available by default
     WEBGL: available by default
     VIDEO_HDR: available by default
   Absturzverhinderer hat Funktionen deaktiviert
   Lösungen
   Fehlerprotokoll
 Medien
     Audio-Backend: wasapi
     Max. Kanäle: 2
     Bevorzugte Sample-Rate: 48000
     Roundtrip-Latenz (Standardabweichung): NaNms (NaN)
     Ausgabegeräte

(removed here)

     Eingabegeräte

(removed here)

     Leistungsmerkmale für Medien (Media Capabilities)
     Datenbankeinträge auflisten
 Umgebungsvariablen
   MOZ_CRASHREPORTER_DATA_DIRECTORY: C:\Users\......\AppData\Roaming\Thunderbird\Crash Reports
   MOZ_CRASHREPORTER_EVENTS_DIRECTORY: d:\.....Thunderbird\Profiles\......\crashes\events
   MOZ_CRASHREPORTER_PING_DIRECTORY: C:\Users\.....\AppData\Roaming\Thunderbird\Pending Pings
   MOZ_PLUGIN_PATH: C:\PROGRAM FILES (X86)\FOXIT SOFTWARE\FOXIT PDF READER\plugins\
 Wichtige modifizierte Einstellungen
   accessibility.lastLoadDate: 1537522160
   accessibility.typeaheadfind.flashBar: 0
   browser.cache.disk.amount_written: 762603
   browser.cache.disk.capacity: 1048576
   browser.cache.disk.filesystem_reported: 1
   browser.cache.disk.smart_size_cached_value: 358400
   browser.cache.disk.smart_size.first_run: false
   browser.cache.disk.smart_size.use_old_max: false
   browser.display.show_image_placeholders: false
   browser.download.folderList: 1
   browser.search.region: DE
   browser.theme.content-theme: 1
   browser.theme.dark-toolbar-theme: false
   browser.theme.toolbar-theme: 1
   doh-rollout.home-region: DE
   dom.events.asyncClipboard.clipboardItem: true
   extensions.lastAppVersion: 153.4.0
   font.internaluseonly.changed: true
   font.minimum-size.x-western: 10
   font.name.monospace.tr: Consolas
   font.name.monospace.x-baltic: Consolas
   font.name.monospace.x-central-euro: Consolas
   font.name.sans-serif.tr: Calibri
   font.name.sans-serif.x-baltic: Calibri
   font.name.sans-serif.x-central-euro: Calibri
   font.name.serif.tr: Cambria
   font.name.serif.x-baltic: Cambria
   font.name.serif.x-central-euro: Cambria
   font.name.serif.x-western: Arial
   font.size.fixed.el: 14
   font.size.fixed.tr: 14
   font.size.fixed.x-baltic: 14
   font.size.fixed.x-central-euro: 14
   font.size.fixed.x-cyrillic: 14
   font.size.fixed.x-unicode: 14
   font.size.fixed.x-western: 12
   font.size.variable.tr: 17
   font.size.variable.x-baltic: 17
   font.size.variable.x-central-euro: 17
   font.size.variable.x-western: 10
   gfx.crash-guard.d3d11layers.appVersion: 78.14.0
   gfx.crash-guard.d3d11layers.deviceID: 0x0402
   gfx.crash-guard.d3d11layers.driverVersion: 20.19.15.4531
   gfx.crash-guard.d3d11layers.feature-d2d: true
   gfx.crash-guard.d3d11layers.feature-d3d11: true
   gfx.crash-guard.status.d3d11layers: 2
   gfx.crash-guard.status.wmfvpxvideo: 2
   gfx.crash-guard.wmfvpxvideo.appVersion: 91.12.0
   gfx.crash-guard.wmfvpxvideo.deviceID: 0x0402
   gfx.crash-guard.wmfvpxvideo.driverVersion: 20.19.15.5171
   gfx.direct2d.disabled: false
   gfx.direct3d.last_used_feature_level_idx: 0
   idle.lastDailyNotification: 1791302199
   layers.mlgpu.sanity-test-failed: false
   media.gmp.storage.version.observed: 1
   media.hardware-video-decoding.failed: false
   network.cookie.CHIPS.lastMigrateDatabase: 2
   network.cookie.cookieBehavior: 1
   network.cookie.prefsMigrated: true
   network.cookie.samesite.enabled: false
   network.cookie.validation.lastEpoch: 1
   network.cookie.warnAboutCookies: false
   network.hosts.nntp_server: news.xyz.de
   network.hosts.pop_server: pop.gmx.net
   network.hosts.smtp_server: mail.gmx.net
   network.predictor.cleaned-up: true
   network.trr.blocklist_cleanup_done: true
   places.database.lastMaintenance: 1791302200
   places.history.expiration.transient_current_max_pages: 72617
   plugin.flash.lastmod_hi: 351
   plugin.flash.lastmod_lo: 880304500
   plugin.importedState: true
   plugins.flashBlock.enabled: true
   plugins.update.notifyUser: true
   privacy.bounceTrackingProtection.hasMigratedUserActivationData: true
   privacy.purge_trackers.date_in_cookie_database: 0
   privacy.purge_trackers.last_purge: 1791302199862
   privacy.trackingprotection.allow_list.hasMigratedCategoryPrefs: true
   security.disable_button.openCertManager: false
   security.osreauthenticator.password_last_changed_hi: 818435
   security.osreauthenticator.password_last_changed_lo: 2033913528
   security.remote_settings.crlite_filters.checked: 1635495714
   security.remote_settings.intermediates.checked: 1635495714
   security.sandbox.content.tempDirSuffix: {17f21197-8f98-4226-af65-d04a3e3ae283}
   security.sandbox.plugin.tempDirSuffix: {61686b11-b61a-4133-a7cc-fefed06e1536}
   security.ssl3.ecdh_ecdsa_rc4_128_sha: false
   security.ssl3.ecdh_rsa_rc4_128_sha: false
   security.ssl3.ecdhe_ecdsa_rc4_128_sha: false
   security.ssl3.ecdhe_rsa_rc4_128_sha: false
   security.ssl3.rsa_rc4_128_md5: false
   security.ssl3.rsa_rc4_128_sha: false
   security.viewing_mixed: true
   security.webauthn.show_ms_settings_link: true
   signon.importedFromSqlite: true
   storage.vacuum.last.content-prefs.sqlite: 1790628210
   storage.vacuum.last.index: 2
   storage.vacuum.last.places.sqlite: 1790257006
   svg.context-properties.content.enabled: true
   ui.osk.debug.keyboardDisplayReason: IKPOS: Touch screen not found.
 Wichtige nicht veränderbare Einstellungen
   fission.autostart.session: true
   media.utility-process.enabled: true
 Chronik- und Lesezeichendatenbank
 Barrierefreiheit
   Aktiviert: true
   Barrierefreiheit verhindern: 0
   Accessible Handler verwendet:
   Dienst für Barrierefreiheit aufgerufen durch: UIAUTOMATION|C:\Windows\System32\EoAExperiences.exe
 Bibliotheken-Versionen
     Minimal vorausgesetzte Version
     Verwendete Version
     NSPR
     4.39
     4.39
     NSS
     3.125
     3.125
     NSSSMIME
     3.125
     3.125
     NSSSSL
     3.125
     3.125
     NSSUTIL
     3.125
     3.125
 Isolierte Umgebungen
   Ebene der isolierten Umgebung des Inhaltsprozesses: 7
   Effektive Ebene der isolierten Umgebung: 7
   Status der Win32k-Sperre für den Inhaltsprozess: Win32k Lockdown enabled -- default value is true
   Ebene der isolierten Umgebung des GPU-Prozesses: 2
 Start-Cache
   Festplatten-Cache-Ordner: d:\....Thunderbird\Profiles\....\startupCache\startupCache.8.little
   Festplatten-Cache ignorieren: true
   Festplatten-Cache bei Initialisierung erkannt: true
   In Festplatten-Cache geschrieben: false
 Internationalisierung & Lokalisierung
     Anwendungseinstellungen
     Angeforderte Sprachen: ["de"]
     Verfügbare Sprachen: ["en-US","de"]
     Anwendungssprachen: ["de","en-US"]
     Region-Einstellungen: ["de-DE"]
     Standardsprache: "de"
     Betriebssystem
     Sprachen des Betriebssystems: ["de-DE"]
     Region-Einstellungen: ["de-DE"]
 Externes Debugging (Chromium-Protokoll)
   Verbindungen werden akzeptiert:
   Adresse:
 Drucken
 Angepasste Druckeinstellungen

(removed here)

Open

"inbound.att.net (POP) .. certificate revoked"? I can't download eMail!

My eMail has worked fine for many years - until this morning. When I first tried to "get messages", I got a response, "connection to inbound.att.net server reset". I re… (les mer)

My eMail has worked fine for many years - until this morning.

 When I first tried to "get messages", I got a response, "connection to inbound.att.net server reset".
 I restarted Thunderbird, and then the computer (Windows 11), and when I tried again, I got, ""inbound.att.net (POP) .. certificate revoked".
 I can login to my ATT webmail, but I can't download eMail to my computer via Thunderbird.

... In my attempt to upload this question, I looked for the TB Version, but it said to update Thunderbird. I did so, not it is back to telling me "connection...reset"

 Please help!
Solved 2 15

certificate has been revoked. unable to receive email.

AVG sends message: "We've identified a site certificate problem" "Trust for this certificate has been revoked." Looking at certificate page that AVG provides is Greek … (les mer)

AVG sends message: "We've identified a site certificate problem" "Trust for this certificate has been revoked."

Looking at certificate page that AVG provides is Greek to me. General tab displays:

"This certificate has been revoked by its certification authority"

issued to : inbound.att.net

issued by: Digicert Global G2 TLS RSA SHA256 20250 CA1

Valid from: 4/12/26 to 10/28/26

Details tab:

lists a bunch of things that I don't comprehend and offers an option to "copy to file" and lists a number of formats to copy the file to.  Have no idea which would be the one to use. 

Trying to access email directly from browser has not been successful because it wants verify my identity by sending message to my phone, but it does not send anything.

Solved 8 9

Get Messages not working in the latest version 157.1

Since the recent update, 157.1, I cannot get the "Get Messages" button to work and it will not download new emails. I can download a previous version and it works just fi… (les mer)

Since the recent update, 157.1, I cannot get the "Get Messages" button to work and it will not download new emails. I can download a previous version and it works just fine. I also cannot stop the auto updating function even though I check the box to not auto install.

Open

1. Can we white label thunderbird? Is there a cost associated with it? ⁠Is there a cost for the enterprise AI.

1. Can we white label Thunderbird? Is there a cost associated with it? 2. Is there a cost for the enterprise AI extension used on Thunderbird, and how secure is the user… (les mer)

1. Can we white label Thunderbird? Is there a cost associated with it? 2. Is there a cost for the enterprise AI extension used on Thunderbird, and how secure is the user data from being exposed while using the extension? 3. For the Thunderbird enterprise, is there a cost attached to it?

Open 1

Thunderbird wide or other views don't display correctly

This seems to have occurred in the last month or so. Whenever I click on a message in the folders pane, the message is not displayed correctly in any of the three layout … (les mer)

This seems to have occurred in the last month or so.

Whenever I click on a message in the folders pane, the message is not displayed correctly in any of the three layout views but, if I am offered to display in a browser, it does! Also, if I select 'Edit as a new message' it displays correctly, as also do iPhone and iPads. The screenshot shows the problem?


Any ideas, anyone?

Open 1

Disparition de sous-dossiers (.sbd) après un glisser-déposer vers un compte IMAP

Bonjour, Je sollicite votre aide concernant la restauration de dossiers de messagerie dans Thunderbird. Contexte : Le problème est survenu suite à un glisser-déposer par … (les mer)

Bonjour,

Je sollicite votre aide concernant la restauration de dossiers de messagerie dans Thunderbird.

Contexte : Le problème est survenu suite à un glisser-déposer par erreur d'un dossier (et ses sous-dossiers) depuis ma boîte nominative (IMAP) vers une boîte mail générique partagée. Le dossier a disparu de l'interface Thunderbird et du Webmail, mais la arborescence physique existe toujours sur mon disque.

Détails techniques :

Dans Paramètres des comptes > Dossiers locaux, le Répertoire local pointe sur : C:\Users\sojanati\messagerie\Mail

Dans ce répertoire, je retrouve la structure sous forme de dossiers .sbd (comme INBOX.sbd) ainsi que des fichiers d'index .msf.

Cependant, les sous-dossiers et leur contenu n'apparaissent pas dans l'interface Thunderbird sous Dossiers locaux.

Comment puis-je forcer Thunderbird à réindexer ces dossiers .sbd ou récupérer les messages associés ?

Merci d'avance pour votre aide !

Open

157.0.1

I managed to add one email account, but now is impossible to connect any other, it doesn't matter if it's a gmail or a personalised email. It says: Authentication error.… (les mer)

I managed to add one email account, but now is impossible to connect any other, it doesn't matter if it's a gmail or a personalised email.

It says: Authentication error.

Unable to log in at server. Probably wrong configuration, username or password

both give me the same error.

Any advice?

Open