Diễn đàn hỗ trợ Thunderbird

Hello,

I'm trying to create a calendar event with irregular recurrence. Not only is the starting time different, but also the duration. Since AFAIK this is not possible using the interface, I directly edited the .ics to this:

RDATE;VALUE=PERIOD:20260506T063000Z/20260506T130000Z,20260507T054500Z/20260507T110000Z

I then manually synced the calendar. The starting time is honored, the duration, however, is not. I found the entry in the .ics changed by Thunderbird to this:

RDATE:20260506T063000Z RDATE:20260507T054500Z

How can I get Thunderbird to honor the different durations?

Thanks

Thunderbird keeps opening a Google authentication window, asking which account to use. I have two gmail accounts (both of which work just fine), and another google account that I manage a calendar for (it works fine as well). How do I work out which account is seeking authentication?

I'm trying to remove a couple accounts that I no longer use in Thunderbird. A window keeps popping up asking for a password, but the mail service is no longer available. When I click on the red delete button for that account, nothing happens. I've deleted all the mail in one of them which I was able to do as I thought I might need to do that first, but I still can't delete it after that. The other one won't even let me delete the emails. How do I delete these so I stop getting asked to put in a password for accounts that are no longer valid and I don't want anymore?

140.10.0esr (64-bit)

Thunderbird for Linux Mintmint-001 - 1.0

I run two browsers on Linux Mint 22.3

Librewolf and Waterfox.

I prefer Waterfox. It is set as default in its own settings

I open preferred application in system settings and choose Waterfox as preferred WEB. Thunderbird is preferred as MAIL I click on an email, waterfox promptly opens my 4 home pages....not the email I return to preferred applications and choose Librewolf instead of waterfox, click on the email again, and it promptly opens the email.

Waterfox has been set as the default browser. I am looking for a way to set Thunderbird to open emails with waterfox......I cannot find such a setting in Thunderbird.

I searched and found this : Make sure to check the settings in both Thunderbird and your operating system to ensure Waterfox is selected as the default for opening links.

Is there a way to do this in Thunderbirds settings?....It does not make sense that there would be, becasue Librewolf opens the email anyway....

Thunderbird is used on a domain network of 100 computers, all connected to a Carddav address book. About 10 computers have stopped syncing their address book. Reconnecting the address book doesn't help. Newly added email addresses don't sync. Everything is fine on the other computers, all running Windows 10.

Hey, I want to set up my .gmx.de mail account in thunderbird (140.10.0esr (64-bit), Mozilla Thunderbird Snap for Ubuntu). it used to work, on my phone and the gmx website it is working. I did not change any of my credentials but suddenly it raised the "unable to log in to ..." error on my laptop only (Ubuntu 24.04.4 LTS). After several tries I deleted the account and tried to set it up again from scratch. It finds a server profile which is consistent with the one on my phone (where it is working just fine) but login is not possible using the same password.

I have a shared family calendar and a private google account calendar that is separate. I tried importing some events from the family calendar to the private calendar. I created a .ics file, and started using the calendar import function in Thunderbird on my Ubuntu laptop. I found the file, selected it, and filtered for current and future events. I then clicked the confirm import button, and the screen changed to a view progress screen. This screen correctly shows the target account, the source file, the import type, and the number of events, so I think it's correctly set up. The progress bar shows "Importing... 0%", and there it appears to stall, consistently after several attempts. I saw another thread that talked about read-only calendars, but I don't see a setting, either at the Thunderbird level or at the calendar level that might be restrictive in that sense. Is there a preparatory step or a setting I'm overlooking?

Hello from Sweden, and I'm sorry if any grammar or expression is incorrect.

All of a sudden login credentials is asked for (see attached image), for an old account that I've already (a couple of weeks ago) deleted both in Thunderbird and also on the server (on sethpylad.se). I always click the Cancel button when this comes up, but I don't understand this at all because when I try to send an email to the existing new account on the same server it all works as it should? So it seems like it only ask for credentials for the old/deleted account?

Is there any way I can change any setting to not be annoyed by this from here on?

I'm using a HP laptop. And on my desktop computer I can't really recall having this problem at all.

Edit: I just deleted an Address Book that was associated with that old account, but the problem prevails. /edit

Thanx in advance! Seth Pylad from Sweden

There is an attachment with searchresults. This searchresult belong to an accountname with an emailadres of my own. But in the searchlist there is another To: address. Here it is Gospel Music Hoogeveen | Tineke

It should info@contras.nl

How did I get this and how do I get rid of this.

Support will be appreciated.

Henk

New email account successfully added on a pc and an android phone. However, Thunderbird fails to add the same account on a different pc. All details are correct. Please help

Since the last update , Tbird is either a default window occupying ~1/3 of the screen , or full screen. The horizontal divider between message list and messages works. resetting/changing font size didnt solve it neither did

changing toolkit.legacyUserProfileCustomizations.stylesheets from false to true

or creating a new profile

OS linux mint 22.3 Tbird 140.10.0esr

Since yesterday (27 Apr 2026) any and all mail that comes into Thunderbird gets marked as SPAM. I searched online and found people saying that I could reset the junk training filter, so I did this, but incoming mail was still marked as spam. The next suggestion was to delete the training.dat file. Did that, restarted Thunderbird and incoming messages are still marked as spam. The last suggestion was to turn off adaptive junk mail controls. Didn't want to do that because I assumed that it would let spam through. Nope. Turned it off, restarted Thunderbird and two emails from my work came in and got flagged.

I'm running version 140.10.0esr (64-bit) on Windows 11. I am using IMAP to connect to the mail server but it's not running any spam detection software (like Spamassassin). I know this because it's my server and even if it was, no updates have been preformed since the first of this month and this just started happening yesterday. Combine this with the bug that Thunderbird notifies me of incoming mail, even if it's spam (didn't post about this because there are plenty going back a couple of years), is starting to make me look for an alternative.

The attached message pops up when in coming mail is coming in, not anything gong out. How can I fix this. See attached image. I have checked my sent messages..nothing shows up..I have checked my out box in local folders still nothing shows up