Thunderbird Community Forum

Problem with recurring events in the caldav (external) calendar. If you delete one instance of an event (today), events for previous days are automatically created.

Thunderbird ver. 140.7

Dieses unerwünschte Zeichen - lässt sich nicht entfernen und verhindert das Absenden von emails. Es erscheint auch auf der Hilfeseite von Mozilla, etwa links oben. Über Blindkopie lässt sich dennoch eine email absenden. Dort erscheint das Zeichen - nicht!

Having followed the instructions on the desktop, I've copied the QR code to get Thunderbird on my Mobile but the only folder appearing in each of the three email accounts is the Outbox. How do I sync the other folders please?

When I opened Thunderbird on my PC this morning, the text of messages received no longer displays. What is displayed is a link to the website to view the message. How can I recover the display please. Thank you. Elise

Dear Support Team,

I am experiencing problems logging in to my Onet email account. The issue occurs when I try to access my mailbox, particularly through Mozilla Thunderbird.

Could you please let me know what might be causing this issue? Is there any specific configuration required in my Onet account settings before logging in?

Additionally, do I need to reconfigure any settings in Thunderbird (such as incoming/outgoing server settings, ports, SSL/TLS, or authentication method) to ensure successful login?

I would also like to mention that I do not experience any login issues when using email accounts from Wirtualna Polska (WP/O2) or Gmail in Thunderbird. The problem seems to occur only with my Onet account.

Please let me know if you need any additional details from my side. I would appreciate your guidance on how to resolve this issue as soon as possible.

Kind regards, Konrad

The task notification dialog does not show up, when Thunderbird starts and a task is overdue. It did so until some time in the autumn 2025.

The dialog shows up if Thunderbird is running when it is time for the reminder.

Is this changed behavior or a bug?

Best regards Gorm

Address sidebar CONTENTS disappears after turning on to forward or send a message, The sidebar is still there but empty of addresses, which do appear for about a second on opening the forward message tab.

thank you Ron Herron

I am trying to create my outlook.com account in Thunderbird. I see the Account Hub box, and have typed in my email address. But when I type in the password, I get an error message, "Authentication failed. Please check the username and password". It then says, "Exchange auth error". I have checked and double- and triple-checked the spelling in the email address and password, and signed in to my email via the Microsoft outlook.com page using the same email and password. I can sign in to my email using the latter method, but Thunderbird keeps giving me the same error message and won't create the account in Thunderbird. What am I doing wrong?

When a message is removed from a folder via that folders' Retention Policy, is the message permanently deleted or does that message go to Trash? I use Thunderbird with Gmail via POP. Thank you.

おとといからYahooメールの受信が出来なくなりました。 その前にはいつも通りできておりました。

Thunderbird上で起動時の送受信時にPOPサーバーへのログインに失敗しましたと表示されます。 パスワードを変更した覚えもなく、いつものパスワードを入れましたが、ログインできず送受信が出来ません。

こんな感じですが、よろしくお願いいたします。

My old calendar kept events in Reminder mode until I dismissed them. Thunderbird dismisses them too soon. Can I force it to keep displaing the reminders?

I did something one time, but it suddenly showed a whole month of reminders! That was too much. I just want to be the one who decides to dismiss. Thanks.

When I send a message, it actually is sent, however the windows showing send progress continues on for some time, after which I need to click on cancel to close this window. At first I did not think the mail was being sent, however after replies on them were being received, and when sending an email from one of my email addresses to another, I get the windows message that the email was received. Why isn't the process window closing when the message was actually sent??

I was sending an email with an attachment I wanted to check the attachment before I sent it. But I chose windows media player and it won't work I went to remove media player but I couldn't open my attachments, so I put the attachments back on but I still can't open my attachment. What do I do so I can Read my attachments again Thank you Richard

Changed my BT mail password. I can receive mail but when trying to send I am asked to enter password which is not recognised. The SMTP server does not reccognise this. I have checked other questions and all seems well in my settings, i.e. changed stored passwords, but I must have missed something.Any advice most welcome Don

Hi,

Since updating to Thunderbird 140.7.1esr (64-bit) on Windows 11, moving messages from Inbox to any folder takes about 7 seconds.

Details:

Account type: IMAP (Cogeco)

Happens in all folders

Inbox has ~600 messages (not large)

Was working normally before the recent update

Delay occurs every time moving a message from Inbox to another folder

No freezing — just a delay before the move completes

No antivirus changes

Issue started immediately after update

This appears to be related to IMAP sync behavior introduced in 140.x.

Has anyone else reported this, or is there a known regression?

Thank you.