Thunderbird Community Forum

I copy/paste emails a lot for my job, which needs to include from, sent, to, cc, bcc, and subject:

From: Sender <sender@email.com>; Sent: Wednesday, January 21, 2026 at 11:27 AM EST To: John Doe <johndoe@email.com>; Cc: Jane Doe <janedoe@email.com>; Bcc: Subject: Email Subject

Currently, I am using the plugin ReplyWithHeader, which will produce this style of header on reply/forward, but is there a way to display this in the email body on view, without me having to reply/forward to produce the headers in the email body?

Hi,

I’m experiencing an issue while trying to print emails to PDF in Thunderbird. Instead of opening the print preview or print dialog, Thunderbird sends the email straight to the default printer. Because of this, I don’t get the option to choose my PDF printer or adjust print settings.

This started after updating to a newer Thunderbird version, and earlier versions did not behave this way. The menu still shows Print…, which normally indicates a preview or settings window, so this feels like unexpected behavior.

Has anyone else faced this issue, or is there a setting or workaround to restore the print preview before printing? Any help would be appreciated.

Thanks!

Have: When quoting, "start my reply above quote" and place my signature "below my reply (above the quote)" but signature continues to show below the quote.

What have I missed in this setup?

I upgraded to TB v115.10.1 and find it somewhat difficult versus previous app.

My problem is the same as with previous versions - I cannot resize the message pane. On Classic View left pane I have 20+ email accounts listed. On top right pane I have the inbox for a selected email account and takes 1/2 of window. On bottom right pane, the individual message displays with header and takes the other 1/2. The message pane height size can be reduced with mouse but not increased. I want it to take at least 3/4 of right pane to make previewing emails easier.

In older versions it was possible to do this but not for several years. Any suggestions as to how to edit the settings? Nothing seems to be available that I can see.

 Thanks!

I use a 32" monitor. In Thunderbird, I want to create some Message Filters. I bring up the Message Filter window and enter a filter. When I go to click the OK button to save the filter, I cannot see the button on the screen so I try to scroll the window via the scroll bars to find it but it won't scroll. I next try to shrink the window by using the CTRL key plus the mouse scroll wheel but nothing happens.

I cannot see any way to create and save Message Filters in Thunderbird unless the window can be reduced. Why does Thunderbird NOT use Windows facilities? I can generally shrink or expand a window by the Windows facility of CTRL + scroll wheel, but not so in Thunderbird.

I need some direction, please.

What font can used in Thunderbird that will display a capital I with top and bottom bars? Otherwise it's impossible to determine whether the letter is an capital i or the letter L.

A few weeks ago, I had to re-add my email account in Thunderbird and took the opportunity to switch from POP3 to IMAP. I am generally familiar with the synchronization behavior associated with IMAP. However, I did not pay close attention to the Sent folder at the time, and I have now noticed that there are almost no sent emails stored on my local computer. When I checked with my email provider (freemail.web.de), I discovered that the retention period for sent emails is limited to 30 days. Apparently, the sent emails (in the “Sent” folder) are synchronized with the server and are therefore deleted from my local system as well once they are removed on the server.

I have now increased the retention period on the server, but I would still like to clarify the following points:

• Is the synchronization of the Sent folder in fact intended to mirror the server folder (i.e. including the deletion of emails)?
• If so, is it possible to configure the synchronization to be one‑way only (i.e. that new emails from the server are added locally, but emails that are no longer present on the server are not deleted from the local Sent folder)?

-- Thunderbird 115.18.0 (32-bit) on Windows

What is the name of the element that corresponds to the background color of this message pane? This is a default background of a message window when I first open Thunderbird. I already have userChrome setup to modify other elements and I attempted to use the inspector tool to try to find the name of the message background color but I could not identify it. Please provide the name of the element in the form that I can use to add to my existing userChrome.css file to customize this black window pane.

I'm having problems getting my signature to appear in Thunderbird as it does in my soon-to-be former email client. I've attached pics of the signature as it should appear and as it appears when imported to Thunderbird. I can edit the HTML code, but I'm not sure how to correct things like the image not importing when the link is correct and how to get rid of the dotted line border that shows up in Thunderbird when it does not appear in my current email client signature. I attempted to attach my HTML file, but cannot. I can post the code, if that would be beneficial. HELP!

When I open an email that contains a thread, each response (or reply) shows up in its own window. This results in LOTS of email windows on the screen, and I have to fish around to find the one I want to see. Then I have to close all of them one at a time. How can I change this so the email thread is in one continuous window?

Hi

When Thunderbird is started maximized it overlap taskbar if is set to hide and taskbar won't show until Thunderbird is minimized and maximized. Another way is to press the Win key two times. Then the hided taskbar can be shown/use. The same thing happens to Firefox. Only when is first started. Then if Firefox is minimized and maximized, press Win key two times, press F11 two times then the hided taskbar show/hide normal.

It is a setting that can be changed to start Thunderbird and Firefox in full screen and do not overlap hided taskbar?

'Hey Ed .. need your advice again'

Open your TB profile:

- TB menu > Help > Troubleshooting Information

- click the Application Basics > Profile Folder 'Open Folder' button

- close TB and rename the folderCache.json file to folderCache.jsox

Restart TB and the list should be gone. Note this will also remove the list from the R. click > Copy To list.

======================================================

These are the 3 files in the profile folder. I'm confused ..which file do I rename? TB is closed This file folderCache.jsox .json - create date 01/13/2026 was created when I used above procedure on 1/13/2026...

I already have a folderCache.jsox file ... renaming it leads to file being unusable. '

folderCache.jsox - create date 12/21/2025

folderCache.jsox .json - create date 01/13/2026

folderCache.json - create date 02/02/2026

Thanks,Mike

I have lost the send, attach buttons on my new emails? not sure what I touched.

I can recieve emails and reply but when I want to write a new email I am not able to send it as the button to send is gone.

also the New Message button is gone.

There is a way to add a folder to a Thunderbird account that combines other folders. The one I want to create would be "Inbox and Sent emails combined". I did it in the past, but I can't remember how to do it anymore. Can someone help with this? I am running Thunderbird 140.8.0esr (64-bit) on Linux Mint.

i am confused at this point: Double-click toolkit.legacyUserProfileCustomizations.stylesheets to true in Settings/General/Config. editor, restart TB.

The row background and text colours can be set with css (see picture):

/* row bg, text colours for selected messages table view*/ tr[is="thread-row"].selected {

 color: white !important;
 background-color: red !important; 

}

Help/Troubleshooting Info, Profile Folder, Open Folder, close TB, create a new folder named chrome, create a new document in chrome with a text editor, name it userChrome.css, Save as type: All files *.*, copy in the above code, change the colours as desired. Double-click toolkit.legacyUserProfileCustomizations.stylesheets to true in Settings/General/Config. editor, restart TB.

Just installed TB 147 under Windows.

Previously, there was a menu item File/Compact Folders (plural).

It is now (at least on my machine) replaced with File/Compact Folder (singular), which only compacts the currently active folder. I cannot now find a way to compact all folders at once.

What am I missing?

Bonjour, j'utilise Thunderbird sur MacBook M3, MacOs Tahoe 26.2, sur Thunderbird j'ai 3 comptes messagerie .bbox et un compte .gmail dans le dossier envoyés de chacun de ces comptes ne figurent QUE les messages envoyés du mois en cours ou du mois précédent si aucun message n'a été envoyé le mois en cours aucuns des messages envoyés auparavant ne s'y trouvent. Tous les comptes sont en mode IMAP J'ai vérifié les dossiers sélectionnés dans les paramètres des différents comptes et le dossier envoyés est bien coché dans chacun la méthode d'identification est bien Oauth2 pour tous... Le problème étant présent sur les 4 messageries et pas seulement sur la messagerie gmail il me semble que ce soit un problème de paramétrage Thunderbird... Merci de vos retours