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I was referred here from Thunderbird Bugzilla report 2081665.

We are experiencing a recurring problem with Thunderbird 153 on several Windows workstations in a business environment.

The important point is that the problem also occurs with completely new Thunderbird profiles created from scratch. It is not limited to migrated or old profiles.

On one workstation this has already happened to three separate Thunderbird profiles.

Typical sequence:

1. Thunderbird 153 is installed. 2. A completely new profile is created. 3. Mail accounts are configured manually. 4. Everything initially works normally. 5. After some time the profile begins to malfunction. 6. Thunderbird Settings no longer open/respond. 7. The address books still exist, but address autocomplete when composing a new message stops working. 8. Creating another new profile temporarily fixes the problem, but the same behavior can return later.

Troubleshooting already performed:

- Troubleshoot Mode - extensions disabled - tested without the existing prefs.js - rebuilt Thunderbird caches and profile UI state - recreated indexes/databases - completely removed Thunderbird from Program Files, AppData\Roaming and AppData\Local - clean Thunderbird installation - clean profile created from scratch - Thunderbird executable and profile paths added to Kaspersky Endpoint Security trusted applications/exclusions

Removing prefs.js from an already affected profile did not restore the Settings window.

A clean test profile initially works correctly.

We have also encountered this behavior on other workstations. Some users have more than 100 message filters and many folders, so rebuilding profiles repeatedly causes significant administrative work.

Several affected computers had Windows user accounts renamed in the past.

We also experienced a separate issue where the Attach File dialog stopped appearing while drag-and-drop still worked. Bugzilla identified this as the already known Bug 2077590, so I consider that a separate issue.

For comparison, after completely cleaning Thunderbird from an affected workstation and installing Thunderbird 115.3.1 with a clean profile, the same workstation currently works normally.

Because freshly created Thunderbird 153 profiles can later develop the same problem again, simply recreating the profile does not appear to be a permanent solution.

Environment:

- Windows workstations - Thunderbird 153 ESR - Kaspersky Endpoint Security - multiple IMAP accounts - business environment

What diagnostic information should I collect from the next affected profile before replacing it?

I can provide:

- Thunderbird Troubleshooting Information - Error Console output - profile file names/sizes/timestamps - Windows Event Viewer logs - sanitized prefs.js - comparison with a working fresh profile

Bugzilla report: 2081665 Known separate attachment bug: 2077590

When I installed Thunderbird, I selected Custom Installation, thinking I would get an opportunity to select which components I wanted installed. All it allowed me to do is define the installation folder. Not very "customizable." Anyway, I already have a calendar app that I'm perfectly happy with, don't need a task manager, and don't use chat, Is there a way to remove those apps from Thunderbird?

Used old method to setup email accounts and it worked fine. New UI will jam the user name and host name and host name together for new email account setup. In UI for: Username It will have the full user and host together eg. test1@test.com Then during account setup after you enter password, I can see it on the bottom of the UI panel, so like this... test1@test.com@test.com When you go back it will put in the Username field, test1@test.com even when you deleted the host test.com from it. Also the host field screws up. It will put a period in front of the host name eg. .test.com So you have to delete the period.

I am having problems sending email form my account, [redacted]@smartpointproducts.ca. I login successfully and the program responds saying the account has been successfully registered however, it still refuses to send emails from this account.

Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) . Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'.

I have no problem receiving emails on this account [redacted]@smartpointproducts.ca however sending or replying doesn't work it's not the passwords here's my SMTP server settings screenshot below.

It's very odd. Normally moving an email, say from the Inbox to the relevant year's archive, takes "no time at all".

Which is true for all the mailboxes shown on the attached screenshot, EXCEPT for the four at the bottom. Moving even one message from Inbox to Yiddish can take ten seconds or longer (with the dreaded "Not Responding" occasionally). Moving something in the opposite direction is also screwy, only from those four.

I had thought that it was because they're rather large. This first started when there were just Yiddish and MSW, and I split off most of the earlier years into the archives shown. To no avail.

It's only an annoyance, but I'm puzzled about how such a thing could happen.

Also very slow tagging or untagging a message just in those mailboxes.

Moderator Notes:

• need a performance profile https://support.mozilla.org/en-US/kb/profiling-thunderbird-performance

There used to be an option before, but now it just always pops up. It is never useful for me and constantly switching to offline mode or using some other account first is a pain. There is no button to continue manually.

I just purchased a new PC. HP OmniDesk Slim model with Intel Core 13, Win 11 home version, 8 GB DDR5, 512 GB SSD. I just read a previous article, "Move Thunderbird data to a new computer." When you make the move, does it also bring your account settings with the move? And by the move, I mean copying and pasting from old PC to new PC. Or do I enter this info manually? I am moving data from old HP w/win 10 originally installed, to new HP w/win 11. I also read a previous article on forum, "An alternative method for manual transfer between Windows 10 and Windows 11 computers." This was also included in this article. "This section assumes you have a default Windows installation and will work on computers upgraded to Windows 10 from previous Windows versions." My old computer had win 10 originally installed, not upgraded, (as stated above). Any info/help you can offer will be deeply appreciated. Thanks

Hello everyone. From time to time, the "Attachments" button stops working. It can be clicked, but nothing happens. Occasionally, restarting the PC or the email client helps. More often, the only solution is to reinstall the entire program—which also means losing access to years' worth of emails, as I then have to wait for them to be re-downloaded from the IMAP server. What should I do? I’m using the latest versions.

Hi, I would like to install Thunderbird on my computer to connect it to my Wanadoo account. What are the settings: IMAP, ...? I also want to install the folder structure on another drive to avoid loading my system drive. What other things should I be careful about to avoid making mistakes or wrong settings or security ? Eventually, I would also like to add another Gmail account or another provider. Thanks in advance

Hello, I did a mistake, I installed 2 instances of Thunderbird, one pointing to the system disk and the other to the user data disk. How do I remove the instance that points to the system disk? Best regards

First know that I have threading turned on. I am unable to find how to thread several email messages that I know are related. How can I do that even though they may not automatically be threaded by certain wording? Thanks Russ Pond

Not sure where/how to post this, so starting here (and happy to move/amend this posting as appropriate.) 15-Oct-2026

Background: I've got a yahoo ("free") email account for many years, and wish to move the current contents of my Inbox to a folder (on imap, not local). Recently yahoo appears to have moved to "cloud" arrangement internally (not sure, but it appears to be the case.) The problem I'm experiencing (below) I believe may be yahoo's back-end cloud processes getting out of sync with Thunderbird's view of the same activity. Therefore, I'm seeking help on how to accomplish this (=I don't think there is a bug in Thunderbird, rather this is a plea for how to manage yahoo's email service for my account.)

Symptom: Moving large number of emails between folders both hosted on yahoo, peers to my inbox on yahoo, using imap - the "export" imap service). Thunderbird says it completes the task, but many (not all) of the moved emails re-appear in yahoo's inbox after a short time, so this makes moving a large (more than a few hundred) emails a *very* laborious process.

What I'm trying to do: I wish to move my current inbox (has about 7.5K messages) to an IMAP-hosted folder (same account, etc.,yahoo email would see this folder as a peer to inbox). When I select all of the messages on inbox and tell Thunderbird to move these to the local folder, thunderbird appears to indicate the task was completed. If I move a very small number of emails at a time, that does complete successfully (=thunderbird says task completed, and the moved emails do not re-appear in yahoo inbox.)

Thanks for looking at this (long) posting and (particular to moderators) if I've posted this incorrectly or in wrong place, please assist!

Dave

Recently I updated Thunderbird. When it rebooted, all my emails in the INBOX and ARCHIVED folders were gone. I have tried the usual solutions, including REPAIR FOLDER buttons. Those archived messages were important. Any chance of finding them?

This is actually the same in Firefox, and both only since today, working fine before:

Typing Ctrl-C does nothing, Ctrl-X deletes whatever is selected, but it does not end up in the clipboard. In fact, if the clipboard contains something, it will be removed (Win-V still shows it, but it can no longer be pasted). When copying from somewhere else, pasting with Ctrl-V works.

AFAICT, no issues with any other programs.

Latest versions of FF (151.0.2) and Thunderbird (151.0.1), on Windows 10.

What could be wrong?

Thanks, Ralf

Despite my attempts to find an error in my outbound mail settings, I keep getting the message below.

The test of the connection to the server passes everytime, but the mail form will not allow mail to be sent.

It's the ESR version. It all started when I added a vcard to my outbound mail.

"Sending of the message failed. An error occurred while sending mail. The mail server responded: Sender refused. Please verify that your email address is correct in your account settings and try again."

I am trying to replace my Outlook account which has been blocked by Microsoft AI and remains blocked after multiple attempts to get it working again. I have just added a new account and can send @mail.uk e-mail from Thunderbird. However, there is only an in-box folder shown on Thunderbird and no trace of the sent e-mail - although I can confirm that is was received by two test recipients. I did consider a Thunderbird e-mail account as a replacement but, at 79, I avoid additional costs whenever possible. Can you suggest an alternative free e-mail service which works on Thunderbird? My g-mail account used to work but now I am having password problems.

Dear Support

Kindly help me in solving the problem of not being able to attach files in my Thunderbird emails. Thank you Yours sincerely Ana Cristina Figueiredo

I have been getting the following error message each time I log into my email today: " The STAT command did not succeed. Error getting message number and sizes. Mail server pop.bluedomino.com responded: [SYS/TEMP] Internal error occurred. Refer to server log for more information. [2026-10-14 12:31:46]" I get a message for each of my email accounts. My spouse also gets the message on hers. The server we use has just been transfered from Blue Domino to Network Solutions.