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Others have mentioned this but I'm not sure if there is a fix/anything is being done. The threads are all from previous Thunderbird versions.

I use Thunderbird for work. I have to find specific emails and folders - get to them quick. I am no longer able to do this. It's really distressing.

This is something really basic, that should be the default or else really easy to change.

I'm on a Windows machine and using Thunderbird 140.3.0esr. I've been using Thunderbird since 2003 and never had any problems. Now I'm panicking!

I recently transferred my Thunderbird email to a new Windows 11 laptop. Everything is ok, except the font size in received emails can best be described as very tiny. I've tried everything to increase the font size, but nothing helps. My screen has a resolution of 2880x 1880 Any help would be much appreciated. Thanks.

Hi Thunderbird,

Windows would not let me keep any apps when I upgraded to Windows 11 so I am having to set up Thunderbird again. But I also had to sign into my Yahoo account again - and had to change the password. Now Thunderbird can find my address (<redacted>@yahoo.com) but it cannot verify the password.

I had an email I had to send today so had to download Outlook - against all my principles! Please, please, find a way I can get back to Thunderbird and expunge Outlook! I donate every month and have done for years. . .

Best wishes, Kitty

Thunderbird just updated to 144.0.1 (64-bit), and now I see a blank area where message list used to be. This true for all accounts and all folders.

I used to see this issue temporarily after compacting folders, but usually (but not always) went away and messages showed up. Sometimes I had to close and restart TB. Now even that wont bring up the lists. I'm dead in the water. And, yes, I did reboot my computer as well. Screenshot of this state attached.

Thanks for any help--it's urgent. Bert

I am having an issue with retrieving my email in Thunderbird. On laptop, using Version 140.2.0esr | Released August 19, 2025. No changes were made to Thunderbird settings. The email is showing up in the Comcast portal, but for now having it forwared to a Gmail account. Tried changing password in Comcast (and in Thuderbird) to no effect. Tried deleting my Comcast email account in Thunderbird and re-adding it, but no change. Can send out email fine, just receiving it is the issue.

Interestingly, I use BlueMail on my phone and it, too, has the same issue and will not retrieve from Comcast. Thanks in advance!

Hello; Windows 10 & current version of Thunderbird. I am trying to add Messages Filters to filter out spam (getting more and more of that!) but the "OK" button on the add message filter is below the bottom of the screen. The window cannot be raised or resized to make the button visible. Photo below. Moving window does not allow me to raise window above top of screen. Keyboard (Alt-Enter) / Move will not work. Changed windows screen size just makes window larger but button still below bottom of screen.

Non-functional work around. Highlight Message name. Press Shift-Tab TWICE. Press ENTER. UGLY!

Tech since DOS 3.0

Thank you for your time and attention.

I spent a lot of time setting up a bunch of message filters and organizing messages into folders. I had created about twenty filters, and was running them and moving messages, etc.

My computer crashed due to a flaky display card (intermittent, but happens infrequently, so not corrected yet.) The only recovery possible is turn the power off and restart the PC. When I restarted Thunderbird, all my filters were gone. I have pretty good "save your work often" discipline, so I thought I was covered once the filters appear in the "Message filters" dialog. I don't see any option to explicitly "Save Filters", but it is possible I am missing it somehow.

How and when does Thunderbird save these? Is there something I need to explicitly do? Close and reopen the filter window? Exit Thunderbird?

Also related: Can Message Filters be exported and imported?

Running Thunderbird SUPERNOVA 115.10.1 (32-bit) on Windows 7 Professional. I'm seeing an update to 116.0 is offered now.

Thanks for any advice.

Hi all, I have a client who uses Thunderbird and wants to close his orange.fr email address, but has thousands of emails he needs to be able to continue to refer to / archive. I advised to move all the emails from the IMAP server/inbox folder, to a Local folder in Thunderbird. Having done this, I tried to remove the account, did NOT check the box “Remove Message Data” and (wrongly assumed) there would still be a way for him to see his orange.fr emails in a local folder somewhere, but they all disappeared. I’ve tried to trace the path for the local folder but can’t see a way to see them once the account is removed. Can any suggest the best way to GUARANTEE that he can close his orange.fr email account and still retain his old emails? I’m guessing that if he closes the account but doesn’t remove it from Thunderbird, the account will retain the local folders but will be unable to connect to the orange.fr email address. I suppose that would be a solution but I’m guessing Thunderbird will throw a connection error every time it opens? is there a neater way? We would prefer to avoid trying to export them to another mail client.

Any suggestions / advice greatfully received. I’m just nervous that he doesn’t lose access to his old emails after closing his orange.fr email account. TIA Russ

What happened to the "Delete all marked junk" option in T-bird? After the latest update (140.1.1esr) this option for deleting all emails (in the current folder) that are marked as 'junk' seems to have gone away. At least, I am unable to locate it.

RE: Thunderbird 128.2esr Nebula I like to keep things simple and I know I was able to this before (ie: SuperNova), although I can’t remember how. How do I set “PERSONAL Address Book” as my only (default) address book; or how do I eliminate Collected Addresses? I prefer to keep all my contacts in my “PERSONAL Address Book”.

Some of my older emails, which were in HTML, now appear as text with full headers and formatting data, making them unreadable. How do I convert them back to HTML?

Thunderbird 128.2.0esr (32-bit)

Message filters not working after transfer to new windows device. (Apologies for long report below). Problem is similar to that reported and still unsolved here: https://support.mozilla.org/en-US/questions/1391209

All old messages automatically accessed under IMAP protocol sit within correct email folder on new device.

Message filters rules successfully located on old device, copied and placed in corresponding windows folder on new device. Email folder structure looks identical on both devices.

New messages sit in inbox on new device, without being filtered. Instead error messages appear, repeatedly.

"The folder 'xxxx' could not be found, so filter(s) associated with this folder will be disabled. Verify that the folder exists, and that filters point to a valid destination folder.

The folder 'yyyy' could not be found, so filter(s) associated with this folder will be disabled. Verify that the folder exists, and that filters point to a valid destination folder.

If same new messages are accessed on old device, they later appear in correct folder on new device, and no longer sit in inbox

How to make email folder structure on new device visible to filter rules there ? This is necessary for filtered email to work successfully on new device, without requiring old device to be operational - it will be taken out of service in near future.

I FOUND no close TOPIC.

Google calendar allows color-coding of events - but the display is highly inadequate. T-bird 128 calendar apparently HAS no option to color events. But events are FAR easier to see WHEN color-highlighted. Would this be a difficult option??

I just recently switched to Thunderbird and Libre Office to get rid of MS365. I am happy so far, if there wasn't one particular issue which I do not find a solution for:

I know how to sort messages with the newest on top, I know how to toggle the threaded view on and off. But I would like to use the threaded view and find it impossible to adjust a descending order within a thread. So I end up with the newest thread on top, but the thread headline shows the oldest message and if I unfold the thread it's in ascending order.

This is a major issue for me. To avoid overlooking incoming mails, I need to switch of the threaded view. Websearch didn't provide me a solution.

Hello TBird fans,

I wonder when ThunderBird native client for Android (currently named "K-9") will evolve to a point when internal calendar syncing will work properly, eliminating the need to import google calendars into desktop Tbird ? Is it possible to estimate that time now, or it's better to search for alternative solution(s) ?

I will need an Android synced calendar app soon, I would prefer ThunderBird, since I've been using it for at least a decade, and I'm not even satisfied but became enthusiast also. Best email client ever made IMHO. It would be very convenient to use TBird's integrated calendar.

I've searched the forums for "android calendar sync", but didn't find corresponding info, just this archived thread is closest to my question (particularly the 3. question of it) : https://support.mozilla.org/en-US/questions/1436077

I'm not willing to use google calendar, since I don't want unstoppable notifications and ads when my events are due in time.

Thanks, Peter ;-)

I get a message like this every time I start Thunderbird. The topic came up last year but the conclusion was along the lines of "...this problem will be fixed in version 128" but it was never clear whether or not the User followed Mozilla's support replies or what they had to do to clear the email message from Thunderbird. .....Well I'm running version 128.1.1esr and the problem still exists.

My questions:

1. What is Thunderbird trying to do? Compact individual email files? Compae from ct the whole Thunderbird Profiles folder?

2. Is the problem the size of the Profiles folder or the overall size of the hard drive the Profiles folder resides on? What is the Hard/solidstate drive is the maximum?

3. Is the problem related to the amount of Free Space left on the Hard/solidstate drive or is the issue the number of individual files?

4. Is the issue related to the number of Thunderbird files and/or folders OR is it related to the total number of files and/or folders on the hard drive?

5. Is there a limit to the number of sub-folder levels that Thunderbird can navigate?

Thank you.

Tom

Tom O'Brien TOBrienArchitect@gmail.com

Sending a mail results in the following message:

Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Disallowed HELO string.