Komunitné fórum Thunderbird

I'm trying to get Thunderbird working on Windows.

I can't read thin faint Windows-style font rendering. I can set * {font-weight: bolder !important;} in userChrome.css, but since Thunderbird relies on boldness to distinguish unread and read messages, I'd need to find another way to distinguish these.

I also use MacType, but it doesn't seem to affect Thunderbird or Firefox.

As far as I can see, either 1. if the css can distinguish unread and read messages, maybe I could set extrabold and semibold, or I could set different colors. Or 2. I could set a bolder font with good-enough script support.

bold textsome of my email won't send or receive and when i try to reinstall them they give error that it can't connect to the server i know the info is correct

Hi everyone,

I'm working on a privacy-focused email setup and ran into an issue with Thunderbird.

Here's the situation: I use a catch-all email address for my domain, so anything sent to *@mydomain.com gets forwarded to my real inbox at secret@mydomain.com. This allows me to use unique aliases like alias1@mydomain.com, alias2@mydomain.com, and so on, without revealing my actual email address.

That part works well.

The problem comes when I reply to messages. Thunderbird automatically sets the sender as secret@mydomain.com, even if the original message was sent to an alias. That defeats the purpose, since it exposes my real address to the recipient.

Thunderbird does let you set up additional identities, but maintaining one for every alias quickly becomes impractical if you use a lot of them.

I tried a workaround where my mail server adds a custom header like "X-Alias: alias1@mydomain.com" to incoming messages. The idea is that when I send a reply, the server could read that header and rewrite the From address accordingly, keeping the alias intact and hiding my real address.

Unfortunately, I found that Thunderbird strips out custom headers like X-Alias when sending emails, which breaks this solution.

So I have two main questions:

1. Is there any way to configure Thunderbird so it preserves specific custom headers (like X-Alias) when sending messages?

2. Alternatively, is there a better approach to replying from the alias address automatically, without exposing my real one, and without having to manually create identities for each alias?

I'd really appreciate any tips, suggestions, or insights. Thanks!

Recently, Thunderbird is saving my sent messages to "Sent Messages" which is a folder that exists on my remote server. Up until this time, they were going to a folder called "Sent" which is where I want the messages to go.

I navigated to Account Settings and clicked on Copies & Folders and found the option for placing a copy in the "Sent" folder on my server. So, I chose that option, but messages are still being saved to "Sent Messages."

I have the latest version of Thunderbird that I am using on a Windows 11 laptop. I'm not sure what else I can tell you that will help.

We been using Thunderbird for over 20 years and used MozBackup while it was supported and used it a few times when something got corrupted. To migrate from one PC to a new PC, we always used the "manual method" described below. As our files are 10.2 GB (mine) and 6.4 GBMB(wife's) in size, that goes like this:

If your profile folder is larger than 2 GB, you need to use your file manager and create a backup copy of your profile folder yourself.

1. To find your profile folder, you can use the Open profile folder link in the first step of the Export tool. You will see the contents of your profile folder in your file manager. The profile folder has a name like abc12defg.default-release. 2. Select and copy the entire content (content only, not the folder) of your profile folder. 3. Create an empty folder where you want to keep your backup, e.g. on a USB flash drive. You can choose a helpful folder name like Thunderbird_profile_backup_2022-06-28. 4. Paste the contents of your profile folder into your empty target folder.

On the larger 10.2 GB filetransfer, after launching TB on the new machine there was a lot of the spinning circle icon appearing / disappearing ... then it just stopped, gave it some time. Rebooted and all was fine with the world. Most accounts were accessible, one was not and I copied that from the desktop open on the same desk.

With the 6.4 GB file transfer to wife's laptop, it did not work ... tried again, no luck.

Tried my 10.2 GB file on wife's laptop and it worked fine. Can't understand why, after each attempt TB was uninstalled and everything TB related was removed from roaming folder. System was rebooted, searched for anything TB related, rebooted, installed TB, closed it, copied folder contents into profile folder on laptop, Rebooted and no go.

It will take the 10.2 GB file but not the 6.4 ... I'm confused.

Is there a font setting to change JUST the font size (event title field) that is displayed on the TB Calendar monthly grid view. Was able to change overall size in TB, but did not really want same change on mail views? Perhaps a specific TB setting (or userchrome command)?

Yes, I did see the question on Calendar Event font size changes, but not applicable to this as I read it...

Thanks for any suggestions, if any....

If I receive and save emails as a .eml file and open in a text editor, I can see there is a "received" day and time and then further down I see a "date" day and time. Thunderbird seems to default to the "date" day and time when the email shows in the message list whereas other email clients use the "received" day and time.

As an example, a large group email written/sent at 10:06 am today - the "date" field is 10:06. The "received field" shows 11:39 am. In this example, the original writer did send at 10:06 but it did not arrive in my inbox until 11:39. Thunderbird shows/sorts the email to 10:06. Other email apps like Gmail, Outlook and Ipads mail app all show/sort the email as 11:39.

I've tried sorting Thunderbird by Date and by Received but the order stays the same regardless.

This issue isn't always noticeable because in most cases, the "Date" and "Received" are within a few seconds of each other.

I can appreciate Thunderbird lists sorting by Date and Received, but it seems like its not working correctly.

TB 140 on Win 10 and 11, and TB for Android - same on all apps.

Hello, I'm trying to deploy a dynamic HTML signature on Thunderbird 140 ESR using policies.json. The goal is to pull user data (full name, job title, phone number) from our Active Directory.

The PostMessage policy for setting the signature is completely ignored. However, other policies like DisableAppUpdate work perfectly, so I know policies.json is being read correctly.

Troubleshooting has confirmed this is not a path or permission issue, as the signature also fails when using a local file (file:///C:/...) and even when the signature is set as direct text inside the policy itself.

Is this a known bug or issue in v140 ESR? Is there a reliable method to deploy a dynamic signature from AD via policy?

Thank you.

Hi Folks - This is a silly question, I'm sure and if there's something in Settings I'm missing, my apologies!

But, with the new version, when I leave my Inbox - whether it's to write an email or read one that has been sent to me - and I return, the Inbox is very briefly empty, then all of the emails in the Inbox show up in a, for lack of a better term, cascading effect.

Everything's working fine - but seeing this every single time is a bit disconcerting. Help?

Since the Thunderbird 140.0.1esr release, my Archive button is randomly not working. With a message selected that I want to archive, either clicking on the Archive Button on the message or in the list view right-clicking and selecting the Archive button from the options menu does not result in anything. It appears that the button is depressed, but nothing happens. If I close out of Thunderbird and immediately restart it, the Archive button starts working again for a time until later when it stops functioning again. I never had this problem with previous instances of Thunderbird before, so I'm wondering if something became broken with this latest release. I'm happy to provide additional information if needed to help troubleshoot why this is going on. I'm running Windows 11 24H2 64bit and am not having issues with any other button in Thunderbird not working. Just Archive. Have also tried it on multiple email accounts. Same problem with all of them when the button is not working.

All our emails are on IMAP so should keep a copy on the server like outlook which does. Yet today all our emails for all email addresses are missing. We have had our server people go back and restore emails back to the 15th when we know they were there, but they are still missing. In the accounts email there were over 120 emails now all gone. Can you help with a solution as to why thunderbird has done this. Its weird email accounts for emails back and forth to say surecalltelecoms are still there, but all emails for ours marketbowl.in have gone missing.

We asked the server provider and they checked the datacentre, no fault logs, no errors so for some reason its thunderbird. All settings are correct same as surecall, yet all emails are missing for ours.

why is everything going to trash in thunderer but not in Comcast.net email what do i do o i eed to reinstall it and uninstall it

can not  do restore point

Ho effettuato un backup con la procedura guidata ma il file è più grande di 2Gb. Ha creato il file zip ma quando provo a dezipparlo per importare le cartelle dice che potrebbe essere corrotto. C'è un modo per recuperare il profilo? Grazie

Hello Please, how can I make Thundebird from main search menu (on the top) to sort the results automatically from newest (forever?).

I get them always from oldest.

I sort them.

Even when I click the small icon on the right, and make "descend", by new search, I get those oldest at first :-(

With the years, it slowly sucks.

Thank You.

Jan

The reminders window that normally starts up when Thunderbird opens no longer appears. To be clear it's the window that shows my daily appointments in a separate window. Thanks

After accidental change to Thunderbird 140.0.1esr (64-bit) all date/time display changed to American format (7/16/2025, 12:55 PM) where it used to be the settings of my machine (Win10 64 bit, language English, region Netherlands): short date dd-MM-yyyy long date ddddd dd-MM-yyyy short time HH:mm long time HH:mm:ss I tried overriding the setting using the config editor and inserted ntl.date_time.pattern_override.date_short and ntl.date_time.pattern_override.time_short, restarted TB which promptly lost the new settings (not saved). Also the Message List Display Options defaults to Cards view after restart, even after changing to Table view.

Please help!

Hello. Since calendar category colorization is not very visible ...

... I created separate calendars for every category. This is semantically wrong but has a nice look – events are fully colored by category:

I now regret this choice and want to correct it:

I need to move >1000 calendar events from calendar "medical" to my "home" calendar and (at one go) assign the category "medical":

from [calendar: "medical" / category: none] --> to [calendar: "home" / category: "medical"]

How can I do this ?

(note: I don't know why the screenshots are not displayed in this message.)