Diễn đàn hỗ trợ Thunderbird

As of Oct 12 2026 I also have this issue. About a week before the 12th I was getting messages that I needed to sign into my RCN account which I would do and it just kept asking me. A few times each night to start then right before it shut me out I had over 50 of these messages just flooding my screen. I never did get a screen shot of that message, but did for the 2 error messages I got later once it shut me out. I shut down my computer the night of the 11th then when I signed back in on the 12th I could not send or recieve any emails. SOmething similar had happened before, but when I shut down again it went away. This time it did not. I then tried to access my emails thru the webmail I can access, but that also had shut me out. I also tried my tablet, a borrowed smart phone, but I could not access anything for my emails. I troubleshooted with my email company and my internet company, but they found nothing. Then I shut off the wi-fi on the smart phone and bin go I could access the webmail. But I still cannot find anything on what to do to fix this. I use RCN for my email, Spectrum for my internet. It is a POP3. Running Thunderbird version 153.5 Oesr (32 bit) Meadow, which says it is up to date. I have norton 360 anti virus & do not use VPN. I disabled my Auto-protect and firewall on the Norton and that did not change anything. I have sent the error messages to RCN and also troubleshot with Microsoft and had some hints, but nothing has come of that yet. Here are the screen shots of the only 2 things I ould capture. The error message was when I was trying to access my email thru Thunderbird. And it came up every time I tried to send messages, not that does not show up anymore and nothing happens when I try and send anything. The second one was when I was trying to access the RCN webmail and it would not let me in on anything I used. Until I shout off the WI-Fi. Then the smart phone could access my webmail account.

I use T-bird for my email accounts and have for decades. This includes accessing an enterprize version (work) as well as basic personal gmails and even another non-google web based email account. I'm an ardent fan. I recently had to reinstall on wiped/cleaned laptop (workplace IT situation). Since then, the 2-factor authorizations have been creating problems. Including: a pop-up whenever I open T-Bird on my laptop, requiring me to sign-in to a ghost Google account. This would be less of a problem if either:

1] the account in the pop-up window hadn't been disabled over a year ago, OR
2] I could change the account in the pop-up to one I still have (can't) 

3] PS: yes, my settings for my other google accounts are at SSL/TLS & OAuth2 (except for the one that requires 4]PPS: No, the ghost account is not listed as one of my 6 accounts in T-Bird, and it was deleted long before I had to re-install T-Bird on the newly wiped hard drive... 5] I cannot log into the ghost account and disable the 'sign-in with google' option, because it's disabled/shuttered/NoLongerLive. 6] Yes, I've cleared the cache. Multiple times. 7] Yes, I've updated to the most recent T-Bird (158.0)

The popup only happens with T-bird, and only on one laptop (ot others I use, which also have T-Bird). I really don't think this is a problem at the google end, much as I'd be happy to blame them.

• MY QUESTION*: Where would T-bird, supposedly a fresh install on a recently wiped drive, be pulling the ghost of a previous account as part of the 2-factor authentifications, from? Would it be in the Config Editor? Bottom line: How can I make it stop?

Recently I updated Thunderbird. When it rebooted, all my emails in the INBOX and ARCHIVED folders were gone. I have tried the usual solutions, including REPAIR FOLDER buttons. Those archived messages were important. Any chance of finding them?

I use Thunderbird with a info@... account hosted by TransIP.

When I send an email, especially when I reply to a previous email and even more when this was my own email, the sent email is not always saved in the Sent folder: neither in the webmail of TransIP nor in Thunderbird. It seems random when emails are and are not saved in the Sent folder.

The replies are sent through; the recipient receives them.

What can I do?

in Thunderbird email until last night I had folders I had set up for my old emails subdivided into subfolders for finance medical etc. I also had a folder for sent mails This morning they have disappeared and been replaced by folders INBOX drafts INBOX sent INBOX spam and INBOX Trash; all are empty. How do I recover the old folders and their contents?

This is actually the same in Firefox, and both only since today, working fine before:

Typing Ctrl-C does nothing, Ctrl-X deletes whatever is selected, but it does not end up in the clipboard. In fact, if the clipboard contains something, it will be removed (Win-V still shows it, but it can no longer be pasted). When copying from somewhere else, pasting with Ctrl-V works.

AFAICT, no issues with any other programs.

Latest versions of FF (151.0.2) and Thunderbird (151.0.1), on Windows 10.

What could be wrong?

Thanks, Ralf

Despite my attempts to find an error in my outbound mail settings, I keep getting the message below.

The test of the connection to the server passes everytime, but the mail form will not allow mail to be sent.

It's the ESR version. It all started when I added a vcard to my outbound mail.

"Sending of the message failed. An error occurred while sending mail. The mail server responded: Sender refused. Please verify that your email address is correct in your account settings and try again."

Hello,

I’m having trouble adding my Gmail account to Mozilla Thunderbird. The Google authentication process completes successfully, but the problem persists in Thunderbird, and I’m unable to configure the account correctly.

I have double-checked the account names and credentials, and I can confirm that they are correct. The authentication process has been completed successfully multiple times, and the passwords have also been verified. Therefore, the issue is not caused by incorrect account names, passwords, or authentication details.

I have attached screenshots showing the problem for reference.

Could you please help me identify the root cause of this issue and explain how to resolve it?

Thank you for your help.

Best regards,

I was using Thunderbird 153.4.0esr 64-bit and my send feature on GMail stopped working. It just spun and spun with no connection.

So, I removed the GMail account from my accounts list and then tried re-adding it, but only received the following error (see image attached). This implies what? I have an account at GMail already? I have a remnant of the previous working account in my configuration? It was working fine until today.

I'm using the automatically derived ports (993 inbound and 465 outbound). That error message appears immediately after having clicked the "Continue" button.

System:

 Kernel: 6.8.0-147-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0 clocksource: tsc
 Desktop: Xfce v: 4.18.1 tk: Gtk v: 3.24.41 wm: xfwm4 v: 4.18.0 with: xfce4-panel
   tools: light-locker vt: 7 dm: LightDM v: 1.30.0 Distro: Linux Mint 22.2 Zara
   base: Ubuntu 24.04 noble

I am a bit of a noob, and probably out of my depth, so please bear with me. It also is a bit of a confusing situation so I hope that I can explain it clearly.

A while ago, Thunderbird stopped working. Whenever I tried starting it up, I got an error message saying that Thunderbird wasn't responding. I thought there might be a problem with some update so I decided that I would reinstall the program. As I went to back up my profile, I found out that there were actually two profile folders where in the past I would only find one. I chose to back up both, and procede with de- and re-installing Thunderbird. After doing so I tried to integrate the old profiles back into the new installation. At first, I chose the largest of the to profile maps and copied it where I found it before the re-installation. I created a new profile using the old profile folder through the User Profile menu. This seemed to work! However, I noticed something. I have two e-mail accounts running in this profile. One IMAP and one POP. I noticed that the POP account was missing about a years worth of old e-mails. As if it stopped saving them at some point. I figured they must be in the other profile folder I found before the re-installation. I tried creating a new profile with this profile but when starting up Thunderbird afterwards I once again got the 'Thunderbird isn't responding' message. So I reverted back to the first profile I made, the one with the missing e-mails. Appart from those e-mails, it seemed to be working well. To get back what was missing, I tried copying the files in the "inbox.sbd" of the back up that wasn't responding into the back up that was responding, thinking that if it messed something up, I could just CTRL + Z my way out of trouble. It seemed that there were three locations in the functioning back up that I could copy the files into, each having the server name of the e-mail account that I was missing e-mails from. I tried copying the files in each of them, each time removing the files through 'undo' before trying the next location. As this seemed unsuccesfull I tried restarting Thunderbird again (having removed the copied files from all locations) which resulted in the following error message:

In a pink screen that I have never seen before. After this I tried removing all profiles and starting again with a fresh copy of the backed up profile folder as I figured I might have accidentally changed something in the profile folder I was using. This however keeps giving the same error message.

Clearly, I messed something up. But I don't know what. Can anybody help? One last thing I noticed that in the 'Mail' folder within the profile folder, there where three folders with the server name before, now there is only one. I guess this is a clue?

All help is welcome!

When i send an email , it goes to the destination email address all right, but the problem is that it creates two identical entries in my local "sent" folder. As if i had sent the email msg two times. This happens only with my hotmail.com account. All of my other accounts (gmail, yahoo etc) dont have this problem. I am using a windows 11 laptop, and both my windows and Tunderbird are fully updated.

I am trying to replace my Outlook account which has been blocked by Microsoft AI and remains blocked after multiple attempts to get it working again. I have just added a new account and can send @mail.uk e-mail from Thunderbird. However, there is only an in-box folder shown on Thunderbird and no trace of the sent e-mail - although I can confirm that is was received by two test recipients. I did consider a Thunderbird e-mail account as a replacement but, at 79, I avoid additional costs whenever possible. Can you suggest an alternative free e-mail service which works on Thunderbird? My g-mail account used to work but now I am having password problems.

I swap computers about 3 times in year, and not all of mine emails seen to have transfer. I was wondering if there is any way I could potentially recuperate those emails.

Hello everyone. From time to time, the "Attachments" button stops working. It can be clicked, but nothing happens. Occasionally, restarting the PC or the email client helps. More often, the only solution is to reinstall the entire program—which also means losing access to years' worth of emails, as I then have to wait for them to be re-downloaded from the IMAP server. What should I do? I’m using the latest versions.

I'm getting a popup error message saying "Unable to write the email to the mailbox" on one of my gmail accounts. This has happened a few times before and I'm not sure how I managed to get it working again those times, seems hit-or-miss. I've compacted and run a repair on the inbox folder several times as suggested by others. I've updated and restarted Thunderbird and even updated windows and restarted more than once.

Windows 11 Pro Thunderbird 158.0 (64 bit)

I'm attaching a screenshot from the Error Console (Tools -> Developer Tools -> Error Console)

I was referred here from Thunderbird Bugzilla report 2081665.

We are experiencing a recurring problem with Thunderbird 153 on several Windows workstations in a business environment.

The important point is that the problem also occurs with completely new Thunderbird profiles created from scratch. It is not limited to migrated or old profiles.

On one workstation this has already happened to three separate Thunderbird profiles.

Typical sequence:

1. Thunderbird 153 is installed. 2. A completely new profile is created. 3. Mail accounts are configured manually. 4. Everything initially works normally. 5. After some time the profile begins to malfunction. 6. Thunderbird Settings no longer open/respond. 7. The address books still exist, but address autocomplete when composing a new message stops working. 8. Creating another new profile temporarily fixes the problem, but the same behavior can return later.

Troubleshooting already performed:

- Troubleshoot Mode - extensions disabled - tested without the existing prefs.js - rebuilt Thunderbird caches and profile UI state - recreated indexes/databases - completely removed Thunderbird from Program Files, AppData\Roaming and AppData\Local - clean Thunderbird installation - clean profile created from scratch - Thunderbird executable and profile paths added to Kaspersky Endpoint Security trusted applications/exclusions

Removing prefs.js from an already affected profile did not restore the Settings window.

A clean test profile initially works correctly.

We have also encountered this behavior on other workstations. Some users have more than 100 message filters and many folders, so rebuilding profiles repeatedly causes significant administrative work.

Several affected computers had Windows user accounts renamed in the past.

We also experienced a separate issue where the Attach File dialog stopped appearing while drag-and-drop still worked. Bugzilla identified this as the already known Bug 2077590, so I consider that a separate issue.

For comparison, after completely cleaning Thunderbird from an affected workstation and installing Thunderbird 115.3.1 with a clean profile, the same workstation currently works normally.

Because freshly created Thunderbird 153 profiles can later develop the same problem again, simply recreating the profile does not appear to be a permanent solution.

Environment:

- Windows workstations - Thunderbird 153 ESR - Kaspersky Endpoint Security - multiple IMAP accounts - business environment

What diagnostic information should I collect from the next affected profile before replacing it?

I can provide:

- Thunderbird Troubleshooting Information - Error Console output - profile file names/sizes/timestamps - Windows Event Viewer logs - sanitized prefs.js - comparison with a working fresh profile

Bugzilla report: 2081665 Known separate attachment bug: 2077590

misconversion (mojibake) does not happen when a mail header is as below. Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: base64

misconversion (mojibake) happens when a mail header is as below. Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit

It seems encoding in my Thunderbird does not match 8bit. Several years ago Thunderbird had an option to modify text encoding but I cannot find such an option in the recent versions. It would be really appreciated if anyone help. Thank you.