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I am long time user of Thunderbird and currently using version 128.10. I am having trouble downloading and sending email either from Gmail or from my MS Exchange account as of late (May 2025). Email sometimes selectively downloads but I am no longer able to send email either through my Gmail of MS Exchange accounts as both the Gmail and exchange SMTP servers time out. This problem started with the previous versions of Thunderbird circa Nov/Dec 2024. A Thunderbird or Windows update resolves the problem for a short time but then the problem it reoccurs. Server settings are all correct and have been checked multiple times. I've deactivated Norton AV and firewalls, added and/or verified port exceptions but to no effect. This problems has resulted in many overlooked important emails until they've been double checked on webmail portal. Is trouble sending and receiving emails a broader issue with Thunderbird users and are Google and Microsoft deliberately making it difficult to use Thunderbird as an email client? I've seen older posts dating to 2023 reporting similar problems and I'm surprised that without changing anything on my end that this problem suddenly popped up. Any suggestions on how to resolve?

Thunderbird does correctly mark emails I choose as spam spam. Problem is, TB fails to move these marked-as-spam emails to the selected spam folder. I've searched for cures here but nothing helps. Now what Mozilla??? See attached pics...

Moin,

die emailprüfung von G-Data Internet Security blockt Emails (rein und raus) aus Tunderbird.

Windows 11 Server: worldsoft (mail.worldsoft-mail.net)

Danke für Hilfe Hendrik

I can send mail via thunderbird but now will not get it from earthlink server? tried restarting app, computer and router, no help. My mail is in my web mail but not thunderbird

I downloaded 138.0. I can get email and reply to them but can't start a new message. New message button does nothing. I don't have any add-ons. This is the newest version I believe. Any suggestions?

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Hello Frinds!

Please help me find a solution to a fatal Thunderbird crash that erased the Inbox folder and its subfolder structure. All emails have disappeared, and the cause is unknown. Tried "View" but did not help. Didn't find any local program tools to restore the before-crash-state.

Here are the details:

1. The incident happened due to a random, uncontrolled cursor movement in the bottom left corner of the program window using the "drag and drop" feature. There was no clicking involved. Or maybe it was a coincidence: happened when Thunderbird was upgrading.

2. The current version of Thunderbird Portable is:128.10.0esr on Windows 10 Home.

3. As a result of auto backup creation on the day of the crash, the backup was overwritten by the corrupted original.

4. The size of the main folder has not changed, so I believe the files needed for recovery are still available.

Is it possible that this disaster is the result of a version update? So so far, Thunderbird worked seamlessly.

Looking for help. So far, I have not been able to find a solution, including with the assistance of AI. Thank you in advance.

Best, Max

Hey. Every single time I send an email, it fails with the following message: "ErrnoException: isConnected failed: ECO- NNABORTED (Software caused connection abort)" The strange thing is that is always sends the email straight away when I manually navigate to "Outbox" and asks Thunderbird to try sending it again.

Device info: Samsung Galaxy S21 Ultra, Android 15, One UI 7. It has always been like this, even before the new One UI update.

Hello,

This morning, I am unable to access any of my labels and folders. One solution I thought of was signing out and signing back in to see if it would resolve the issue. However, I am afraid that if I sign-out, will I lose my labels/folders created in Thunderbird? What would you suggest?

Receiving this error a couple times a day when using Thunderbird: "The folder 'Inbox' could not be compacted because writing to folder failed. Verify that you have enough disk space, and that you have write privileges to the file system, then try again."

I can delete some emails but for the most part, everything in the Inbox cannot be deleted. I have looked at other forums but I haven't found a concrete set of steps to get this error fixed. I am not very familiar with the inner workings of Thunderbird, so more details on how exactly to get this fixed if possible would be appreciated.

The related link in Tasks does not open the corresponding email. Normally, upon clicking the link, it would open the email corresponding to the task I created but for some strange reason it stopped working.

I tried reinstalling Thunderbird but that has not helped. link text

Whenever I send an email from my em@ihmaxwell.com account, it automatically shows up with a logo alongside clearly taken from a notification from Jet2 about. flight booking! How do I get rid of this.

Since a couple of days I have a problem with Thunderbird. I can send normal emails without attachments and I have no problem, but when I attach, it keeps loading in 12%, as if it was checking the files, and from there it doesn't go beyond that until it gives a timeout error. I have tried with another email client and it has worked without problem from the same computer. I have paused the antivirus protection in case that was the problem, but it hasn't been the case.

Dear Mozilla volunteer,

I tried to attach a file created in MS Word 365 to an outgoing Thunderbird email message on a desktop computer running Windows 11. An error message immediately said "file not implemented", and it would not accept this message as an attachment. I asked Google how to implement this file, and its reply was a completely inscrutable AI-generated set of instructions readable only by a professionally trained IT expert (if indeed such a person even could read it).

My question to you is: How do I "implement" a file so that Thunderbird will accept it as an attachment? OR: Can you modify Thunderbird somehow so that "implementation" is not required?

Thank you for considering this question.

Richard R. Vance rvance@ucla.edu