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On Saturday morning 27 June 2026 I tried to login my Orcon email account via Thunderbird (which I have been using for a long time). But my login didn't work, I got a message saying "login to POP3.orcon.net.nz with username habitation failed." On 30th June 2026 I reported the problem to Orcon.

Orcon gave me the following settings for Thunderbird. I have done that and even made a new account: Incoming Server Type: IMAP Mail Server: imap.orcon.net.nz Port: 143 SSL: Off Authentication: On (username and password required)

Outgoing SMTP Server: Mail Server: smtp.orcon.net.nz Port: 25 SSL: Off Authentication: Off

Since then I have spent many hours and going around in circles with Orcon's Technical Support to resolve this, but no luck. They blame Thunderbird. I used Thunderbird Troubleshoot Mode. The message that comes up reads: login to server mail orcon.net.nz with username habitation failed. Please can you check that your server settings above are correct? And if there is a bug? Irma

Title: POP3 mail delivering into Archives/Inbox instead of real Inbox — folder appears mis-flagged as special Inbox

Thunderbird version: 152.0.1 (Windows 11)

Problem: After migrating my profile to a new computer (copying the profile folder and profiles.ini, both with relative paths), new mail for a POP3 account (server1, account1, ekonlich@savba.sk) is being delivered into a nested folder "Archives/Inbox" instead of the account's real top-level "Inbox".

Evidence gathered so far: - Real Inbox: mailbox://ekonlich%40savba.sk@savba.savba.sk/Inbox — only 1 message, effectively untouched for weeks - Archives/Inbox: mailbox://ekonlich%40savba.sk@savba.savba.sk/Archives/Inbox — 31,186 messages, 10.9 GB, actively receiving new mail (confirmed with a test send) - Both folders display the same "special Inbox" folder icon in the folder pane - Neither folder can be renamed (rename option greyed out on both) — normally only true special folders are rename-locked - Account Settings shows only 3 legitimate accounts (POP3 savba.sk, IMAP Yahoo, Local Folders) — no hidden/orphaned account pointing at Archives - No message filter is causing this (only active filter is an unrelated SpamAssassin rule) - Identity's archive_folder pref is set to .../Archives (not .../Archives/Inbox), so this isn't the manual-archive-target setting either - Checked prefs.js directly: no mail.server.server1.* pref names an explicit "Inbox" folder path, so the special-folder designation doesn't appear to live in prefs.js - Renamed folderCache.json to force a rebuild — did not fix delivery, and also temporarily broke the Send button in compose windows (fixed by restoring the original file) - Ran "Repair Folder" on Archives/Inbox — only rebuilt the message index (.msf); did not change where new mail is delivered

Current hypothesis: The special-folder (Inbox) flag seems to be stored per-folder (likely inside each folder's own .msf index or an internal DB row) rather than in prefs.js or folderCache.json — which would explain why neither cache rebuild nor folder repair touched it. Two folders under the same account appear to carry this flag simultaneously.

Questions: 1. Where exactly is the special-folder (Inbox) designation stored, if not in prefs.js or folderCache.json? 2. Is there a supported way to clear/reassign this flag from a specific folder via the UI or Config Editor? 3. Could deleting just that one folder's .msf file (Thunderbird closed) force it to regenerate without the incorrect flag, without affecting the 31,186 messages in the mbox file itself? Is this safe?

Happy to provide further logs or additional prefs.js excerpts (redacted) if useful.

Thanks in advance.

I've been using TB for many years, and without warning, when it tries to down load my mail from the Proton mail server, it says it can't find the folder "Inbox". I've tried to "repair" that folder a couple times unsuccessfully. I've restarted the TB program a couple times, but nothing changes. The error shows up on the bottom "instruction line". I've gone through all my settings and find nothing amiss. Not sure where to go from here. -- Just noticed that I had about 80 emails in that Inbox folder that are now missing completely. Normally, I move read emails to there respective folders, and leave important ones in the Inbox for followup. One significant note here, is I'm still using Win 7 premium. So far it hasn't been a problem. Thanks a bunch, Gerald

Martin Belonje

Jul 15, 2026, 13:24 CST

Goodday,

Unfortunately I could not add a screenshot to this message. Under my account [redacted]@zonnet.nl there is a "Postvak IN". This means inbox. In this inbox should new mails appear. Right now there comes nothing in it. However, two lines below there is suddenly another "Postvak IN 22". New emails appear here now. I already tried to drag this inbox into the inbox under [redacted]@zonnet.nl but that doesn't work.

New emails now appear with a yellow bar: The text in the yellow bar at the bottom says: (I translated)

No unique identity was found matching the sender address. The message will be sent using the sender field and the settings of the identity Martin Belonje <[redacted]@zonnet.nl>.

To my opinion this has to do with the fact that the inbox has moved from its original position.

I hope you can help me out.

I've used TB for many years, and keep it up to date. But it suddenly stopped downloads from my email server. Normally everything comes into my Inbox folder and after reading, they are either put into their respective folders or deleted. I had maybe 60 or 70 retained for later attention. (Like due pymnts)

I've tried everything I know, even the mail server connection, but somewhere in the process, I lost everything that was saved in the "Inbox" folder. I got to looking for the profile file, and only found 1 that was recently dated. Not sure if a rebuild would be advisable. Nearly all my (50+) folders show up as normal. Just can't find why the Inbox isn't recognized.

I tried using TB in both safe mode and troubleshoot mode, to no effect. I DO have win 7 Ultimate and hasn't ever been a problem. The error message I get is: "The mail server for account ***** responded with 'mailbox INBOX does not exist!' The name of the folder is "Inbox" as opposed to the capitalized version, but nothing has changed for years, and never been a problem. Go figure??

After _years_ of use and storage, I'm really hurting without it. Any help or suggestions would sure be appreciated. gshantz

I have been a Thunderbird user for many years, although I stopped updating with 102.15.1 (64 bit) as the new features and benefits did not provide a benefit. In the past few months, emails in my Inbox have disappeared, without being manually deleted. Typically the Inbox will keep emails from today and dated back to about six weeks earlier. Everything else is gone but still on the Rackspace ISP. I have Thunderbird running on two PCs (office and home), one iPad and my iPhone.

My account settings are IMAP, SSL/TTS, and message sync don't delete anything.

I have reviewed suggestions online regarding fixing this; including reindexing, changing settings, etc. but nothing has worked. I know that I can create local folders and save a copy there but I did not have this problem before and it is inconvenient to have to save copies, then remember to look at the saved folder instead of the inbox. According to the tech folks at Rackspace the issue is either within my system setup or some change to the Thunderbird program (although I am still running 102.15.1). My preference is to restore the program to its original functionality instead of creating work arounds. Any advice is much appreciated. Thank you.

Hello,

I'm currently using the thunderbird client to open a zoho mail account. I've set several filters (around 40) so that incoming emails are automatically redirected to the appropiate folder. If I click on the download/refresh icon (the little cloud with the downwards arrow), new email isn't received. On the bottom, a small message appears ("No new messages on the server" or something like this). You may think that that is precisely because I don't have new emails but if directly go into any of the folders and once again click on the download/refresh icon all of the emails that were supposed to go into that particular folder appear all at once (even mails that are 2 or 3 days old). Now every day I have to go into all of my 40 folders and click on the refresh button.

I look forward to your help. Kind Regards.

Thunderbird is not responding. Xfinity is working just fine I need help resetting is there any way I can speak with a person? I am totally bogged down caring for my partner with dementia. I am able to go to my settings, etc.

I have an hotmail.com account with no problems whatsoever while logging into Apple Mail, G-Mail etc. but when it comes to Thunderbird it does not let me login. I tried to login first to outlook itself, changing the servers ports etc. but nothing works.

For refrence my current server settings are: Incoming (IMAP): Server: outlook.office365.com Port: 993 Security SSL/TSL and OAuth2

Outgoing (SMTP): Server: smtp.office365.com Port: 587 Security: STARTTLS with OAuth2

I cannot send messages from any of my accounts after migrating to Greenby. I have tried to setup their outgoing server as per their instructions but it does not work. They have a AI tool which I keep going round and round in cycles

After several years of working perfectly,For no reason, I am getting this message when trying to connect to Xfinity email server

"  Login to server mail.Comcast.net with username t_m_f@comcast.net failed."

I have set all Comcast server settings to the default. Going directly to Xfinity email works great . So it must be something wrong with Tbird. I also uninstalled & reinstalled Tbird. This is frustrating !!!!!!

I have about a dozen accounts with over 50 folders, most with a matching filter. About 100k messages, taking up about 1G of disk space. All but one account is merged under my Inbox to have fewer duplicate In/Draft/Sent boxes eating up window space. I'm using 152.0.1 (aarch64) Release branch on a Mac OS X 26. All are POP accounts on a DreamHost server.

At some point it started to show the draft message on every email, which means on incoming as well. I've had this phenomenon for years.

Recently filtering has started to not automatically run on some emails forcing me to run the filters manually. I've run the repair folder options which does not seem to make any difference.

Since switching to macOS 26 it also does not allow me to move Thunderbird child windows, they simply show up on the default location. But that's for another ticket.

I can't send emails from my Thunderbird account. I am however receiving them. Using IMAP. All server settings appear to be correct. Error message reads " Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.stackmail.com timed out. Try again." What's going wrong?

My email provider sometimes fails to send mail, so I find the mail that didn't send in the sending box (发件箱; I don't know the name in English), use the "edit as new mail" option in the mail 3-dot menu (there's a pencil icon on the top of the screen, but it has no reaction) and tap send button again. I find that every time I do this, the mail's sender identity is reset to the default identity.

I know my Thunderbird version is not latest and is beta, but I'm hesitant about updating. Is it a bug or designed behavior?

Steps to reproduce: 1. Turn off your device's network. 2. Compose and send a mail with an identity that's not the default. 3. Find the mail in the sending box, and choose "edit as new mail". 4. Hit send button. 5. View mail in sending box, it now uses the default identity.

When I try to send a message I get the following error message: An error occurred while sending mail: Outgoing server(SMTP) error. The server responded: Cannot connect to SMTP server 209.71.208.9 (209.71.208.9.25) connect error10060 How do I fix this?