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Hello! It seems Thunderbird emails are suddenly being 'threaded'. It is causing great confusion in my office.

I need to see each email from a person separately in order to find them easily and also to reply to each one at the time it is received.

Can someone please explain in very simple non-techy jargon:- a) How I 'unthread' messages already threaded AND b) How I stop any new ones being threaded in the first place.

Thank you Tylex

After installing thunderbird, It takes me hours to figure out that my fonts are too small because of one value in Settings > General > Language & Fonts > Fonts > Advanced > Fonts for Other writing systems gives a too small number.

It seems insane and I don't think users can easily get there. Maybe some users want to set different fonts for different languages and the "Fonts for ..." is for them. However, for most users who just want to change their font size, I don't think it's a good experience to going so deep and find an option in the loooong "Fonts for ..." list.

So please give users a simple option where I can just set my font size without such pain.

I know there's a font size option in TB menu but it doesn't work as expected. In my case, the font size shown in TB menu is 16 while the font size of my plain text emails is 12. And 1. email font sizes will change to TB menu size as long as TB menu font size is not 16. For example, when changing TB menu font size 15 -> 16 -> 17, email text just suddenly goes from 15 to as small as 12, and then from 12 to 17. 2. email font size seems changing with the TB menu font size. However, email text font size will go back to what it was when open another email.

I am running Windows 11 with Thunderbird V144 and the Windows Classic theme. I find the background colors of the Message List Pane and the Message Pane almost the same as background of the Header pane. I would like to change the background color of the Header Pane so that it stands out more. I looked on the internet and found some solutions to most other Header Pane features but not the background color. Most of those solutions were additions to the userChrome.css file that appear not to work on V144.

I would appreciate some help with this.

When using Thunderbird 140 I am able to setup the background color of the message pane for individual messages. However when the messages are threaded, the message pane shows a preview of all of the threaded messages together in the message pane with a different background color than individual messages.

At one time before several updates ago, all messages in my inbox were separate. After a previous update, reply or messages with the same header started be be nested, each one showing only the sender and the subject, which is now the same. I am forced to read through them all to find the one I want. Deleting any in the change can be hazardous.

How to go back the old way of message display?

A fair number of folders in my primary email address's inbox have been out of sorted order for at least several months.

Most of them are folders I access quite often; they now appear AFTER what used to be the last folder ("Zoom").

If this is a "feature," I suggest moving the highest activity folders to the FRONT of the inbox rather than to the BACK.

HOW DO I RE-SORT MY INBOX FOLDERS?

Thank you.

[DESKTOP VERSION] The font display size in the email composition window is at least 2 'clicks' smaller that what is actually displayed in the received email. When writing an email I need to do a double Ctrl+"+" in order for the text to be easy to ready. When I read the sent email (sometimes I need to send emails between accounts - I have 14 between my business domain and my personal domain), the text that I entered is the proper size. I can easily see this because of the graphic image in my signature, which is the same size in the composition window as it is in the received email. See attached composite graphic.

Since a recent update, I am finding Thunderbird almost unusable.

Problem: It is linking emails together that I want to be separate. It shows a little arrow next to the Subject. Is this called Threading?

I just discovered replies to emails this morning in these threads that have not shown up to me as a new email coming in. I've just taken people to task for not responding, when they actually did... days ago.

I can't find any way of stopping the emails linking together. I need all these linked emails to be separated.

I just sent a test email to myself. Then sent a separate test email to myself with the same subject title and they are now linked together. I can't use a system like this.

I've unticked the 'Thread' command in the drop down menu, but that doesn't help.

Is it possible to unlink them all?

Thank you. David Ashworth.

NOTE: I do send you a monthly donation.

Hello people,

When I compose a message in my word programme (Softmaker or Libre), save it in Docx format and copy/paste it into Thunderbird to send it everything is double spaced and nothing I do in the "compose" menu can change that.

I have tried it with "Use Paragraph Format" checked and unchecked and it stays doule spaced and nothing I can find in previous threads seems to address this problem.

What am I missing?

Kindest regards, Colin B 1 October 2025

After the last update, I found that when I point to a message it is highlighted in red. The choice to send a new message is highlighted in red. I find the color garish and want to reset it. How an that be accomplished? Or, can I revert back to the last version while I look for another email app. I have been a supporter for a very long time. I have used this product for more than a decade. I don;t want to switch but ...

Hi, I dont know what setting I have accidently changed but before I used to double click a new message in my inbox on local folders and now instead of reading it full screen now it wants to send it as an email message to someone!

Any ideas to put it back to just read the email and not compose a message with it?

Thanks.

I dont remember having this 'new message template' thing before when I right clicked on a message in my inbox , maybe thats what the issue is?

New messages received by an email account are scattered at random in the inbox instead of being at the top of the list. How can I ensure that the inbox has new messages at the top?

MY SYSTEM: Thunderbird 140.5.0esr running in Linux Debian Bookworm

I have created a filter from a recently received message via pop. The settings are: OK Manually Run OK Getting New Mail: Filter before Junk Classification

Match all of the following From Contains xyz.co.uk

Perform these actions: Move message to XYZ on my mailbox

Press OK

In the Message Filters window, Run selected filter(s) on: XYZ Press Run Now

There is no response, and all the messages remain in the Inbox.

I have repeated the Run Now process on an old filter (by moving the message back to the inbox), and that works fine.

The only oddity of the current message is that it is a no-reply message eg From = no-reply@xyz.co.uk

Any ideas welcome!

Amazon just sent me an email an animated GIF at the top of it. As a result, whenever it's in the preview pane, it's constantly swapping colors and making a visual nuisance of itself. All morning, it's been blinking at me. Is there any way to shut off animations in the preview pane? I almost never want to see an animated gif in an email, but I definitely never want it dancing around in the preview pane.

Når jeg sletter en mail vises på bundlinien ikonet at der stadig er en mail så ikke er læst. Først når jeg trykker på en tilfældig fane forsvinder det. Hvordan kan det ændres.