Thunderbird Community Forum

My email seems to be blocked, I don't have mobile.charter.net Message says it doesn't come from a trusted source.. I've used [edited email from public] @charter.net for over 5 years with no problem.

I have numerous Ionos email addresses. No problem seeing all received emails in Thunderbird app on my Windows PC. But Android app does not show some emails, despite synchronising numerous times. Problem is often with emails not showing in the unified inbox on the Android app. Also a problem with sent emails not showing. Today I looked for an email I had sent four days ago, and it was not in my Android sent folder. Synchronised, still not there. Synchronised again, still not there. Went online to Ionos and opened the sent email. Synchronised Android Thunderbird again and then it appeared. Why can't Anroid Thunderbird see certain emails? Problem seems to be especially bad with emails I have previously opened in Thunderbird on my Windows PC. Doing so seems to make the emails invisible to Android Thunderbird.

J'ai 4 boites de messagerie Orange (France) : Boite 1 envoie un message qui va "anormalement" en "Indésirable" dans la boite 2, au lieu d'aller en Courrier entrant dans la boite 2. Comme si la boite 1 n'avait pas le droit d'envoyer un message vers la boite 2, 3 ou 4...

When I try to send an email, I get the following response. Sending of the message failed. An error occurred while sending mail. The mail server responded: invalid user ID or password. Please verify that your email address is correct in your account settings and try again. Have looked in account settings and cannot see a password anywhere. Email address is correct Help please Carol

I have 4 devices that share a google calendar. If I snooze or dismiss a reminder it applies to all of the devices. I am using the "Provider for Google Calendar" add-on to connect to the google calendar. The author of that add-on says the problem is with Thunderbird since he is using the provided API.

Please add an option to make calendar reminder actions local.

After a recent update to Thunderbird (months ago), I found that when I search through my emails by name, it will find those emails and list them for me. But when I go and click on one of those found emails, it arbitrarily brings up some unrelated email - it never brings up the one that I click on.

How can we fix this? Thanks. Dr. Howard Neufeld

I have used Thunderbird (Windows 11 PC) as my email application with my Road Runner / Time Warner / Spectrum email account for over 20 years. As recently as a week ago I could send emails. Now sending fails with this message - "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) mail.twc.com timed out. Try again.". No problem receiving emails in Thunderbird. I can send emails if I log into Spectrum.net in a browser and I can send emails from my Android phone. All server settings did not change and match those that the Spectrum web site says to use. Thunderbird is up to date - 140.11.1esr (64-bit). Windows is also up to date. Spectrum tech support was no help. Thanks

I think I've tried everything to figure out why Thunderbird will not send emails.

Yes there was an update the last week of May to version 140.11.1esr (64-bit).

Yes the incoming and outgoing mail server info gibes with my ISP (Shaw) - added pix

Yes have done the necessary adjustments to Windows Defender and Firewall.

Yes I have increased mail.news.tcptimeout because occasionally have received message that "Outgoing server

• SMTP" mail.shaw.ca timed out. Try again. Yes I have indeed tried again.

Yes I have called Shaw and they will not offer any suggestions because TB is a third-party.

What's left to try? A version reversion? Thunderbird has been so stable for so long. I even considered Betterbird but it uses the same profile so............

Thanks.

My email account has been showing up in duplicate and I have lost my send emails Would be please to speak to someone to clear up issues [edited phone# from community support forum]

Thunderbird 148+ on Windows 11 repeatedly prompts for the password when synchronizing an Exchange account (professional) configured with the native Exchange support (no add-on installed).

The account only offers “NTLM” or “Normal password” authentication methods. OAuth2 is not available in the account settings.

During synchronization, Thunderbird asks for the password separately for many folders. However, clicking “Retry” usually works immediately without changing the password, and manually re-entering the same password also works.

The issue then reappears for the next folder, causing continuous authentication prompts (I have many folders...).

Actions already tested:

• deleting saved passwords and tokens,
• deleting/renaming key4.db and logins.json,
• restarting Thunderbird,
• recreating the account.

The problem persists.

This looks like an authentication/session handling issue rather than an actual invalid password.

Some mail in my spam folder is marked with the red flame spam icon, and some isn't. It's all spam -- that part is okay. Thunderbird has sorted everything correctly. But why wouldn't everything in the spam folder be marked as spam?

Hello, My Provider is vodafone. Since you updated Thunderbird, i can't send emails. This Problem exist since about 2 Month. Vodafone cant help me, because they said, it is your Problem. I need very quick help. I need emails for my business. Thanks

Thunderbird is very glitchy and slow after the latest update - Thunderbird 140.11.1esr (20260522210329)

Especially, when I get a new email, Thunderbird stops responding for 5-10 seconds and then starts working.

I am using Windows 11

I've been seeing a doubling of *some* incoming messages, where a duplicate message comes very soon after the first one. For example, two incoming messages were received at:

Sun, 07 Jun 2026 14:03:10 +0000

Sun, 07 Jun 2026 14:04:31 +0000

So the second message came in about 1 minute and 21 seconds after the first, and not because of anything I did (as far as I know). But then that was it, no third message came in.

This isn't really a bug, as nothing is harmed, just a repeated message. Any thoughts would be appreciated.

When I highlight multiple messages for deletion; it can take up to a minute to respond; when I am working with gmail or proton, the deletion is immediate. When I am accessing Reagan with browser, the multiple deletions are also immediate. Appears to definitely be a handoff issue. Suggestions? I use Thunderbird on 2 win11 os and 2 linix mint 2.1 machines. I only delete and store to local on one machine (win11) ver/build 23H2: 22631.6199.

I was recently forced to change my gmail password. All of the help messages I found tell me that after I change my email password I have to save the new password to Thunderbird and I don't know where to save it.

(If this is a duplicate, please feel free to delete. I posted last night, but the question appears to have vanished from the forum.)

I'm using Thunderbird 151.0.1. After 151.0.0 was installed, the ability to press "/" ("slash") to search while viewing a message was broken. The slash is ignored, and following keystrokes are then acted upon.

If a search is initiated by pressing Ctrl+F, subsequent searches can be started with a slash. It's only when the first search is done that the slash is ignored.

I've been using Thunderbird since the beginning, so starting a search with a slash is in my muscle memory. As a result, I've inadvertently marked or archived or starred messages, navigated to the next thread or next unread message, etc.

Looking at the release notes, I see that a search function was fixed in 151.0.0. I wonder if this is related to that fix?

In any event, can "press slash to start a search in the message window" be restored? ...thanks!

First of all, Thunderbird is a vast improvement over Outlook, so I'm persisting in setting it up. Unknown to me when I researched Thunderbird, it had an "Import from Outlook" feature. Well this trolled through all of the PST files on my computer and succeeded importing a fair amount before quitting saying that the errors were in some error-file that I can't find (Does anyone know where this error file is located?). So I have a large amount of what I need imported. Strangely, some folders have nothing initially then some time later, the emails are there! But I find the "Favourite" setup annoying. Thunderbird mirrors the setting of favourite with the target folder when you drag it to a higher level. In contrast, Outlook just creates a link to the target folder in its original location. I find Outlook's approach a lot better but still not worth the move back (Is there another way to create a Favourite in Thunderbird that does change the original folder?). Thanks for any help.

I am running Thunderbird 140.11.1esr on Windows 11. I have many email accounts mainly with btinternet which I access with Thunderbird. Most of them work fine but when I tried add another email account with a very large inbox all of the folders download fine but the inbox itself doesn't show any messages but the number alongside the folder says 220479 (which I think is unread messages). I have tried this on 2 different laptops with the same result. I have tried to Repair the folder. The folder is selected for offline use and I have tried to press the Download now button.

Any ideas?

Thank you

Paul