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I believe that version 145.0, newly installed on the 9th December, 2025 was showing server folders correctly; the server folder name matched the client folder name.

After upgrading to 146.0 on the 10th December, the server folder names for some folders are displaying with different client folder names.

The IMAP account has both "spam" and "junk" folders, Thunderbird is now displaying both as "Spam", you can only determine which folder is which by showing folder properties. It appears to users that there are two "Spam" folders now and not the two distinct folders with their own names.

Similar behaviour is happening for "Sent" and "Sent Messages" folders, both now display as "Sent".

These changes are confusing, the client sees two "Spam" folders and two "Sent" folders instead of the original proper server folder names.

Why has the display name for these folders changed?

How can I get TB to display the real underlying folder names?

Hello, In a recent upgrade to Thunderbird Mac OS x146.0.1 (aarch64), the FILTER selection options on some drop down menus are now blank. Example: "Priority" "Status"

These drop down menus now show no options (eg. read,)

I've two screen shots to illustrate.

Thanks for looking into this.

Glenn S

My friend recommended this browser to me. When I tried to customize it, I couldn't find an option to change the hotkeys to my preference. I consider this feature important since I use it for work. Can I do this somehow, and is there any plan to add such a feature to the settings?

Thunderbird message header pane is so large that I can't read messages. The top 2/3rd of my screen has the list of messages, header bar, files, etc. The bottom 1/3 is for the actual email message, but the header takes up nearly half of that with just the "From", "To", and "Subject lines taking up more than half of that space. Depending on the text of the html message, sometimes I can only read one line at a time, which makes it difficult to actually comprehend a message while scrolling, particularly if it's a long message. I can't resize it to make it larger, though I can make it smaller. My eyesight isn't quite as good as it used to be so I use a larger font than I used to, ie: 12pt rather than 10pt, and that makes it worse. Any suggestions?

I recently updated from Windows 10 to Windows 11 and have been using Thunderbird for my 4 email accounts for about a decade. Since the update, all my sent messages have a > sign next to them which I have to click on to view the various messages sent to the same person, with the latest message chronologically displayed near the bottom of the grouping. My thread option has been unselected. This is a new and unwanted layout and I only wish to see my emails displayed individually and chronologically, with the most recent near the top. How do I remove these groupings with the > icons and just see each message displayed individually? My frantic research only points to installing/selecting an 'add on' perhaps. I just want to see my sent emails individually like I have for the last decade as well as in my folders from previous years. SEND HELP!

I have loaded thunderbird and the email preview pane is not displaying. It was OK this morning but has disappeared now. Is this a temp[orary issue or has there been an update of the program.

When I receive a newsletter from my club, it doesn't show the pictures. It does describe the picture and warns it might be AI generated. If I reply to the email or forward it, the pictures are displayed. I suspect this might be a settings problem. The original email includes:

[image: A picnic table and benches on a stone surface AI-generated content may be incorrect.] [image: A group of people dancing in a room with lights AI-generated content may be incorrect.]

[image: A person and person standing next to a vase AI-generated content

may be incorrect.] [image: A person sitting at a table with food on it AI-generated content may be incorrect.] [image: A group of people sitting at a table with plates of food AI-generated content may be incorrect.]

[image: A group of people dancing in a room with lights AI-generated content may be incorrect.] [image: A group of women posing for a photo AI-generated content may be incorrect.] [image: A group of people standing in a room with lights AI-generated content may be incorrect.]

Can anyone shed some light on this?

Hello, When I open a message in Thunderbird (146.0.1 (64-Bit)) and then delete it, the tab should close afterwards. Can you tell me how to set this up? Kind regards Solveig Berends

Hi,

I use the Page Info window quite regularly, it used to be accessible via the right-click menu but this seems to have been removed in recent updates. I can still access it via Ctrl+I, but this isn't as convenient as using the menu.

Could you please tell me how I can put this useful feature onto the menu / toolbar as a shortcut?

Thanks

Owen.

Thunderbird refuses colored text on new Lenovo 17" Idealpad and adds asterisks not written by the author. Example message test: bbbbbbbbbbbbsssssssss ggggggggggggg***234*5678,56 *<==============* The written numbers and the arrow were colored red. No asterisks were written in the message sent. When writing, colors appeared correctly in messages with no asterisks on screen. However, no colors appear and asterisks are added in recorded messages sent and received on the PC. The Lenovo PC works OK in general, so it must be a Thunderbird configuration/function problem on my PC as the message is correctly received with colors without asterisks on my mobile phone. Can you help me correct this PC anomaly? Many thanks

I only want to print the content of the email without the header. Currently, everything is printed, including the headers. This is tedious to read. Two pages of header information and only at the end is the actual content of the email. Where and how can I change this setting?

Hi all,

In a now deleted Windows 10 Thunderbird setup, we used the Config Editor to globally set Delivery Status Notifications as true.

This ensured that every email attempted to return a delivery notification without the user having to manually request one when composing an email.

We have since shifted all our computers to Linux Mint, but I am unable to find this variable in the Config Editor.

Has this been removed?

Thanks! b

I would like to stop version 146.0.1 of Thunderbird from loading yahoo mail when executing Thunderbird in a annoying new window. Just started happening 01/05/2026. Thank you Jeff

I want to have my sent messages in the sent folder on my main account, but Thunderbird insists on putting them in a Save folder in Local Messages. I've changed the settings several times in my account, but the change won't 'stick'

The Delete button (I've just begun using Thunderbird for Android) sends email to Delete-land: gone for good. There is no way to reprogram it to send to Trash. One can, alternatively, hide it on the main screen by setting swipes left and right to None. But it is still there in the Read screen....and potentially dangerous. If you try to set a swipe to Trash rather than Delete, there is no Trash option. So you have to set it to Move and choose Trash each time. This reduces the utility of Tbird Android and means you have to be extra-careful when reading emails.

Also, no way to reduce image sizes (by percentage) when attaching large picture files...unless you reduce them in advance in an image processing program.

Hi Folks,

I would like to see my TB inbox to sort by date. I tried to do that by - Clicking on Message List Display Options at upper right - Selecting Sort by - Date But the messages are not in date order regardless of whether I select Ascending or Descending.

For example recent emails displayed in this order: 1/2/2026 1/1/2026 1/3/2026 (Date not displayed because it's today) 12/24/2026 1/3/2026 (Date not displayed because it's today) I'm using - PC with Windows 11 - Thunderbird release 146.01 (64 bit) which at least now is the latest release.

I welcome and appreciate any suggestions. Thanks, Marc

I uncheckd the checked box labled "check spelling as you type" to disable it and it's still showing spellcheck. It's gettingin the way of me typing and being able to spell on my own. It's extremely annoying that I can turn off a featire and the progra will just ingore that I've turened it off. Why is this an actualy problem? why doesn't this button just work? I want it OFF... Please.