Thunderbird Community Forum

I am working on an article explaining aspects of message verification such as SPF, DKIM, DMARC and ARC. I have been studying how messages are marked as spam. I have observed that some messages that would be purely legit (like from my bank) are occasionally marked spam. Others show inconsistency -- such as my articles from Substack being marked as spam for some addresses I own, while others are not.

I am particularly interested in how Thunderbird is interpreting the header in regards to source verification. In most of my articles I have advocated for a scoring system that would better inform the recipient of the trustworthiness of the message. I noticed there is an X-spam tag on some messages that is based on a scoring algorithm.

Appreciate your assistance.

Eric

I have my calendar from mailbox.org synchronized with my thunderbird via CardDav/CalDav. I have multiple calendars in the same account (e.g. work, free time, brithdays, ...). I cannot change in which calendar an event is saved after I created it.

How to reproduce: Edit an allready existing event and change its calendar (e.g. from "free time" to my "work" calendar).

Expected behaviour: The edited event is now moved to the other calendar.

Observed behaviour: The event is not moved (any other changes to the event are saved though).

It is not the fault of my provider as it works on my phone and on their web app.

This is either a bug in any of two ways:

• It does not change calendars events but it should.
• You are not supposed to be able to change the calendar afterwards and that means the selection of the calendars should be grayed out/ give you no option to save it.

(I know I can Ctrl+X and Ctrl+V it into a diffferent calendar, which I use at moment but that costs additional time.)

Thanks for any help with this :)

PS: I have to choose a topic but the calendar is not even part of that list. What is going on there?

Hey, i have a question

i recently installed my computer new, now i pulled over my Thunderbird profile folder, i have 2 email accounts and like 30 feeds, now when i click on a feed it shows

"feedname - 623 messages"

NO MESSAGES

aka its empty, when i restart its fixed, and i never get a blue update mark aka he does pull new messages but does not inform me

any way to fix this? Thanks :)

I am trying to set up the latest version on Thunderbird on my wife's old Gateway (WIN 7 home premium). The previous version of TB has problems so I deleted it and am starting over. I have manually configured this TB with the server info from the TB accounts on our other computers, but get the error as stated above. What do I need to check?

Thunderbird won't let me login and doesn't deliver my emails. I have reset my password and still can't get my emails. How do I get some assistance on this issue?

I transferred Win 7 Thunderbird Profile (TB)to a Windows machine. It left behind all the other settings, such as when picking up/sending email, passwords are required at the IP to login, get email/send email.

QUESTION: Is there another TB area where the passwords are stored so I can copy those over to the new computer.

I posted this about a week ago, and when I come back, it's gone. That's why I am repeating myself.

A long timer ago, I was told by a user that Thunderbird does not need passwords. It does if you what to get your email. They are setting for each email user. There are 34 under the one TB.

I hope there is a transferable file because changing all the passwords and preference for each account would be the hard way.

I appreciate your taking the time to read this,

~r

I am having a major issue with Thunderbird not saving Outgoing emails in Send Folder with IMAP setting.

Having three mailboxes two are set to IMAP and the third set to POP3. The IMAP outgoing mail creates an alert that mail was sent but copy not placed in your Sent folder due to network of file access errors.

Outgoing mail in POP3 save immediately to the Sent folder.

I am using the latest Thunderbird update:

• Server Type: IMAP Mail Server
• Server Name: IMAP.kinect.co.nz
• Connect Security: SSL/TLS
• Authentication Method: Normal Password

Outgoing Server [SMTP] Settings:

• Description - User name
• Server Name: smtp.kinect.co.nz
• Port: 465
• Connection security: SSL/TLS
• Authentication method: No authentication

Note: Authentication was changed form Normal Password in order to gain some traction on the issue during trouble, cause and correction actions.

Addendum: The PC was fitted to Starlink https://en.wikipedia.org/wiki/Starlink in preparation for use as sole source for internet connection. That was abandoned due to email issues.

Bonjour M. David et grand merci pour votre soutien. Je suis désolé de vous solliciter autant ! Pardonnez-moi mais je commence à être vieux (83 ans et demi …). Je commence mieux à comprendre votre proposition pour la commande « insérer » (on verra l’autre problème plus tard). J’ai cliqué sur la commande « nouveau message » en même temps que sur la commande « MAJ » (je pense que c’est celle qui permet de saisir une majuscule) mais cela ne m’a rien donné. En revanche, j’ai cliqué sur « paramètres des comptes » et j’ai cliqué sur « HTML » (voir image ci-jointe appelée « HTML »), mais cela ne change rien car je ne vois toujours pas comment ajouter la commande « insérer » dans la barre d’outils. D’ailleurs je n’ai pas vu la mention « composition et adressage ». Par contre j’ai essayé d’ajouter d’autres commandes dans la barre d’outils en cliquant sur « affichage » « barre d’outils » « personnaliser », mais je n’ai pas vu la commande « insérer » (voir image ci-jointe « barre outils »). Si vous avez le temps de continuer à m’aider, je vous en remercie bien sincèrement.

Hello Mr. David and many thanks for your support. I'm sorry to ask you so much! Forgive me but I'm starting to get old (83 and a half years old...). I'm starting to better understand your proposal for the "insert" command (we'll see the other problem later). I clicked on the “new message” command at the same time as the “SHIFT” command (I think it’s the one that allows you to enter a capital letter) but that didn’t give me anything. However, I clicked on “account settings” and I clicked on “HTML” (see attached image called “HTML”), but that doesn’t change anything because I still don’t see how to add the “insert” command to the toolbar. Besides, I didn’t see the mention “composition and addressing”. On the other hand, I tried to add other commands to the toolbar by clicking on “display” “toolbar” “customize”, but I did not see the “insert” command (see attached image “toolbar”). If you have the time to continue to help me, I sincerely thank you.

Hallo, kürzlich habe ich einen neuen PC (Windows 11 - Androit) in Betrieb genommen. Seitdem gibt es immer wieder Schwierigkeiten beim Versenden meiner E-Mails. Ich werde ständig aufs Neue aufgefordert den Benutzernamen und das Passwort einzugeben. Wenn ich das tue, und das Gewünschte eingebe und absende, erscheint kurz danach die gleiche Aufforderung, das Gleiche könnte ich endlos wiederholen. Mein E-Mail wird dann aber trotzdem versandt. Was mache ich falsch und wie kann ich das ändern. Vielen Dank für Hilfe MfG Horst Kniepmeier

After initial set up of an email to sign in to that email is impossible with the error message "Something went wrong" The only help is sign in from another device. This is not helpful at all!

This is particularly difficult when trying to set up an email on on an email programme such as Mozilla Thunderbird. Not but a few months ago this was never a problem as I have used this for years with Yahoo emails with absolute no problem.

This has all changed now (January 2026) making it impossible to set up an email by not being able to sign in to the account on the yahoo pop up screen.

This being tried on Linux and Microsoft windows on numerous browsers.

On one Windows computer in your pop up sign on window it just keeps saying turn on cookies in your browser but the cookies ARE TURNED ON? So it is just ridiculous.

A bug perhaps:- If I highlight various messages at once (I use shift and arrow) and then I press delete. When i subsequently navigate to any other message I can't read it, instead I see this message until I quit and reload Thunderbird: We're sorry, but we can't display this conversation, because the messages have been moved or deleted. Has anyone else noticed this and, better still, do you know how to work around it. I'm using Unified Folders by the way, in case that's relevant.

Using the Spell checker in long test the cursor gets behind the popup window of the Spell checker. I know this was _no_ problem in further vcersions. Please change it! So I have to close the window to find the caursor and restart the Spell checker

Neither plain-text nor HTML-signatures are being removed in replies, even though they are at the bottom of the email i'm replying to, prepended by the default -- tag on a dedicated line, as is the standard. I double checked that mail.strip_sig_on_reply is set to true. This happens on two separate accounts configured on my client. Thunderbird Version 140.6.0esr on Tuxedo OS (equivalent to Ubuntu 24.04)

Hello,

I love Thunderbird, but I have recently moved to use a Android device for most of my work, and despite that there is now Thunderbird for Android, I found that there is a feature I really need but it is not working there: moving mails across different accounts. I work daily with four different accounts and sometimes I need to move some threads from to another. I had to move to a different email reader because of that, but I would really love to come back to Thunderbird.

Best regards, Patricia.

Web info says plenty that does not exist. Eg Showing a context menu with "Delete selected" The web says can delete emails with delete or shift delete. It crosses the text out BUT does not delete any emails. Similarly emptying the spam folder is supposed to happen off the right click context menu. Nothing happens except last entry is highlighted.

Ideally I want to select a group of emails in the inbox with the find option then ctrl/A to select them all then delete key to clear them from the inbox. NB. None of these emails are still on the server, just in thunderbird.