Thunderbird Community Forum

Hello!

I am using Thunderbird 140.9.1esr (64-bit) on a Ubuntu 24.04 system. Every time I restart Thunderbird, it reverts to a little used Gmail account as the default account. I have several accounts, but my main email account is a MS365 account. I reset the setting, but every time it is restarted, the default goes back to Gmail. I have tried everything that I've found online, but cannot correct this behaviour.

Do you have any suggestions or assistance?

Many thanks!

Hi, I am hoping that the community can help me find an answer to this. I have two computers that I use for work. The one in the office has TB running all the time and before I leave for the weekend/vacation I would close TB, copy the profile folder to a USB (or copy it to cloud) and then paste the profile folder on my work laptop (at home). While all the settings get copied (local folders structure, addons etc.) as I use IMAP, it downloads all the mail on the new system regardless. I thought that it should have the latest mail downloaded as part of the profile folder, is that not the case? The bigger issue is that none of the Completed Tasks Lists, Templates, etc. get updated. It still shows all the older stuff on the work laptop and no updates carry over from the PC (at work). Going through the profile folder I see multiple copies of the files prefs.js, folderCache.json, global-messages-db.sqlite appended as: prefs-computername.js and folderCache-computername.json etc. (The computername is the name of the PC - office/laptop) The profile name is the same between the two computers. TB is only started after the profile is copied locally. TB version is the same between systems. I am left scratching my head why somethings are copied but not others. Hoping that the community can help me here. Thanks!

When using message filters "Run Now" is often greyed out after running a filter and remains greyed out after the filter has completed filtering. (Hung up?) This does not happen if the filter does not find any matching messages. Clicking on another filter and then returning to the first one returns the "Run Now" button to active (not greyed out). Not sure, but the problem might be associated with filters that copy a message file to a Local folder, or delete messages, or move messages to Trash, or all three. I'm stumped. The problem started recently and I'm not aware of any changes I made to Thunderbird.

I recently created a Google Workspace account. There, I have a user profile with a custom email address. I've set up the new account in Thunderbird, and it is working as expected. If I send a message from my "external" account to the workspace account, it arrives, and I'm able to reply back.

One feature of Google Workspace is what they call "alternate email" addresses. They sort of work as an alias for the native address. I have created one such alternate. If I send a message from my external account to the alias, it arrives correctly in the workspace account. However, when I reply from the workspace account, it does not go back to the originating address, but instead it is addressed back to the alias. If I repeat the experiment from the Gmail web interface, it replies to the correct address.

I've downloaded all the headers, and the Return-Path tag is correct. I can provide the full header if needed.

It feels like there is an invisible forwarding action to get from the alias to the workspace account, and that the reply action is incorrectly finding the interim alias. But that doesn't really seem to be what I see in the headers - although I'm probably not the most expert reader of those.

And it isn't necessarily a Thunderbird issue. I can see that there could be something going on with Google. But this is a good place to start...  :-)

I downloaded Thunderbird and am still getting Outlook emails in the T-bird app? I feel like I'm missing something or doing something wrong. Does this mean I cannot cancel my MS Office 365? TIA Linda Sorry, I don't know how to read the Thunderbird version, but it updated as soon as I opened it today.

Active Sync 16+ is now in force and Thunderbird has lost the sync via TBsync, so contacts and calendar syncing is now dead, unless TBsync is updated quickly, seems unlikely from reading their website. TB has advised that contacts and calendar are still on a dream list and no date for implementation is known. So TB is no longer a substitute for users wanting to escape Outlook. I am a long time user of TB and a donator, so why have you not pre-planned the inclusion of contacts and calendar sooner or even included TBsync into the code and kept its syncing ability uptodate.

TB with just email sync is no different to many email apps that come with laptop and tablets, so I may as well revert to using in my case Apple Mail.

Regards, SPT

We have bought a new computer from our tech guy before. This time, all was fine except for the Thunderbid calendar. The 20 GB of email files are all there and email still works. Only the calendar is blank. Our guy admits he dislikes Mozilla and rarely deals with it. Is there any way we can find the contents of the calendar? The old computer is still here in our house, but we only have one monitor. I had birthdays, lots of birthdays setup as repeating events. I hate to lose that.

This is odd as we didn't lose anything the last time we bought a new computer from same guy. We already were running Windows 11, so that is not the issue.

I used to get REMINDERS for all events/tasks until about some months ago. But now I don't get the reminders for most events/tasks. rearly I do get reminders randomly and ocasionally. I have been using TB (Thunderbird) for many years without any problems. I update TB religeously as updates become available. Please advise the fix. Thanks in advance! Anil Deshpande

Version is 150.0 (64 bit)

Program does not check Pop Mail accounts on startup. Only checking after triggering with button or shift+f5 Timely check is succesfull (1min,10min etc.)

I got 6 accounts and -everyone is checked to include on startup -added/checked config file options;added new lines -tried safe mode etc. -delete json file

None of the above worked.

Any more suggestions?

Kindest Regards

I have Thunderbird on Windows 11. I have been using Local folders for a long time without any problems. I now find that if I try to delete subfolders in Local folders, they reappear as if they had not been deleted. This applies to any mails I have received since 28th January 2026. Could this be associated with a windows update?

After tried many suggested steps to trouble shooting the problems, it still can't download Comcast emails. It keeps pop up "enter password" or "password failed" again and again. But I can send emails. I can't upload the trouble shooting information file to send. Thanks

I can't access to my personal Google account from Thunderbird.

Thunderbird configuration is OK. Cookies authorised.

e-mail account connection process goes this way: - I enter name and e-mail address - I confirm standard configuration found in Thunderbird's FAI database. - Google asks me to confirm that I authorise Thunderbird to share mail, contacts and agenda informations (I was asked my Google pwd only the first time I tried the process). - I confirm my consent - Back to Thunderbirds account configuration window, with "authentication error".

Similar failure when I try to only connect to the contact list or to my calendars (which is my initial will), also from a scholar Google account.

No change after update from 149 .0.2 to 150.0

I have been using TB to access my Office365 account using the TB Oauth protocol, however, it got to be painfully slow when trying to download messages. I had set up rules and folders that worked, albeit slow.

To try to alleviate the slowness I started a new profile to my Office365 account again using Thunderbird's OAuth protocol. It's lightning fast! But it didn't bring down any of my Office365 folders that exist up on the Office365 servers. (see 2nd TB Install screen print below) It had brought down all the folders and previous e-mails in the 1st installation. (see 1st TB Install Redacted. Screenprint below)

I don't know why this might happen, does anyone have any ideas? Is there a workaround or could I be doing something wrong?

Thanks

Dan

Good afternoon! I have always had a specific folder order in my email, with the inbox folder being the first, followed by the sent folder, and so on. However, today I discovered that the inbox folder was at the bottom of the list, while the sent, spam, deleted, and other folders were above it. I was unable to change the folder order back to its original state, and I have been unable to drag and drop or swap the folders. Can you please advise me on how I can restore the folder order to its original state, with the inbox folder at the top and the other folders below it?

When I try to create a calendar event.. Error Message: Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp-mail.outlook.com timed out. Try again.

Hello dear support team Some e-mails in the Inbox are of a huge size, like 32 MB and more, even without attachment. I already used repair function, but it stays the same. In Outlook, the same email is of normal size (80 kb). So, it is not the e-mail provider or the database at the provider. I have had this situation throughout several updates, so it is not specific to a certain update. The ones that have an attachment and the same problem (attachments of less than 1GB but show 42 GB) cannot be moved. The error dialog says: to big to move. Also, the attachments cannot be removed as they show 0 kb and the attachments name is crossed out. This is not true for all mails, but some have this problem. What do you recommend?

I used to be able to drag and drop emails from my inbox into an archive folder. That no longer works. I now have to right click the email, select "move to", then select the account containing the archives, then select "archives", then select the destination archive I need to send it to. On the right click drop-down there's an option to "move to *** again" but if you're moving emails to different archive destinations, that's not very helpful. Is there a setting to reinstate drag and drop?

I receive emails from one source that's supposed to have a banner image at the top. In Thunderbird it shows the broken image icon and the image as an attachment. But in RoundCube it shows as expected.

The html shows:

The image part of the email shows: content-id: <piXdKIOofB>

I'm guessing that those angle brackets around `content-id` are breaking the display, such that it's calling that a mis-match.

Name Thunderbird Version 140.9.1esr Build ID 20260404050724

On both my accounts "Sent" has popped up twice and on bjornla1bn@gmail.com I have been blessed with two "Spam" files. This is most annoying causing trouble. How can I correct this without loosing data?