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I'm using Thunderbird on Ubuntu 24 and have some messages in some mailboxes that have lost their headers. I'm trying to fix them.

Early (1980's command line mail & mailx) mbox files were pure text with messages delimited by a blank line followed by a line starting with 'From ' (or possibly 'From: '). When I open a Thunderbird mbox file in 'vi' it is 'converted', or so it says. I'm wondering what this 'conversion' is and why it's needed.

Please could someone tell me what the strict rule that delimits messages in a Thunderbird mbox file is, and what is it that 'vi' cannot handle that requires 'conversion'?

Thanks

153.3.1esr (64-bit) Thunderbird Meadow Thunderbird Snap for Ubuntuubuntu-snap-build - 1.0

Thunderbird will not let me move messages to the trash folder. If I do move a message to the trash bin the message will re-appear in the in-box. I have tried to follow the steps in the Mozilla support website but that did not work. When I try to delete a message I get the following:

The current operation on "inbox" did not succeed. The mail server for account rex@rexperry.com responded: [TRYCREATE] Mailbox doesn't exist: INBOX/ Trash (0.001+0.000 secs).

I am using an HP desktop machine running W11. This problem did not happen until I switched to the W11 machine.

Any suggestions? Thanks, Rex Perry rex@rexperry.com

I tried to add my Outlook account to Thunderbird, I entered my details and clicked Continue but it stuck in the "Looking up configuration" screen. I then tried doing manual configuration and entered outlook's IMAP and SMTP server but there's an error message that said "Failed logging in to server" and when I try again it became "Incoming server already exists." An OAuth2 popup appears only after I closed Thunderbird and since Thunderbird is already closed the address it's trying to return to (127.0.0.1:41003) is no longer monitored.

Here we go again,I was unable to send email from my yahoo,ca account. I managed to get a password form yahoo and when I re-logged in, all my folders have disappeared. They are still on the webmail version on yahoo.ca, I can now send email though How can I get them back as the folder that the email has: C:\Users\John\AppData\Roaming\Thunderbird\Profiles\a51cb43e.default-release\ImapMail\imap.mail.yahoo-4.com Does not work

I also have Gmail issues for another time

Hi everyone, I’m looking for a reliable method to convert multiple MBOX files to PDF format with attachments preserved. I have several email archives, and manually opening and saving each email as a PDF would take too much time. I also want to retain important email details, such as sender, recipient, subject, date, and attachments.

While searching online for the best MBOX to PDF converter in 2026, I came across Aryson MBOX to PDF Converter Tool. It appears to support bulk conversion and attachment handling. Has anyone here used Aryson for this purpose? How was your experience with the conversion quality, attachment preservation, and overall performance? I’d appreciate genuine feedback or suggestions for other reliable methods

This morning, my email Inbox is empty. I use Thunderbird for four email accounts, and three of them are fine, but the fourth one has an empty Inbox this morning. I didn't (intentionally, anyway) move the emails anywhere, and they do appear to be in the All Mail folder, so I didn't lose them entirely. But I keep my emails mostly in my Inbox and they aren't there anymore.

Any ideas what happened to make them disappear and how I can get them back to the Inbox?

Thanks!

Email being stopped by avast (inbound. att.net ) mailshield. Certificate revoked not expired and can not be updated. Location: other people directory. Thank you David. [redacted] @hotmail.com

Bonjour,

Je sollicite votre aide concernant la restauration de dossiers de messagerie dans Thunderbird.

Contexte : Le problème est survenu suite à un glisser-déposer par erreur d'un dossier (et ses sous-dossiers) depuis ma boîte nominative (IMAP) vers une boîte mail générique partagée. Le dossier a disparu de l'interface Thunderbird et du Webmail, mais la arborescence physique existe toujours sur mon disque.

Détails techniques :

Dans Paramètres des comptes > Dossiers locaux, le Répertoire local pointe sur : C:\Users\sojanati\messagerie\Mail

Dans ce répertoire, je retrouve la structure sous forme de dossiers .sbd (comme INBOX.sbd) ainsi que des fichiers d'index .msf.

Cependant, les sous-dossiers et leur contenu n'apparaissent pas dans l'interface Thunderbird sous Dossiers locaux.

Comment puis-je forcer Thunderbird à réindexer ces dossiers .sbd ou récupérer les messages associés ?

Merci d'avance pour votre aide !

Hallo, ich habe bisher mein AOL Konto über Thunderbird (Version 153.4.0esr (64-Bit)) auf meinem Windows PC (Win 11) genutzt. Vor ein paar Tagen konnte keine Verbinung mehr zu AOL Server aufgenommen werden und es fand keine synchronisierung mehr statt. Ich habe mein AOL Konto in Thunderbird gelöscht und wollte es neu hinzufügen. Der Dialog zum Hinzufügen eines e-Mail-Kontos startet, ich gebe meine AOL Mailadresse ein, die Standard-E-Mail-Einstellungen werden angezeigt (mit Authorisierung OAuth2), das AOL Anmeldeverfahren wird gestartet, meine AOL Mailadresse ist eingetragen, ich nutze die andere Anmeldemethode (mit Kennwort), gebe mein AOL Passwort ein (das funktioniert, wenn ich mich direkt bei AOL anmelde), der Dialog mit der Überprüfung der Zugangsdaten bzw. die Bestätigung der Zugriffe, ich stimme den AGB zu, aber nun kommt die Fehlermeldung von der Seite (https://api.login.yahoo.com/oauth2/error?client_id=dj0yJmk9MGNoTTQ0SjhIN1dSJmQ9WVdrOVdIVnFkVVp2UkZNbWNHbzlNQT09JnM9Y29uc3VtZXJzZWNyZXQmc3Y9MCZ4PTNm&error=unauthorized_client&error_description=invalid+client+id):

Ein Problem ist aufgetreten Versuchen Sie es erneut, oder senden Sie als Entwickler eine andere Anfrage.

Wo liegt das Problem?

Ich hoffe auf Ihre Hilfe Andreas Zai

Unable to add an attachment to the email being sent. After I create answer, I can't add attachement. No any action after clicking "add attachement", no action after clicking menu "add file (Ctr+Shift+A)". Adding file is possible only by windows menu "Send by e-mail", thunderbird create new e-mail with attachment, I must give e-mail adress and only this way I can sent e-mail with attachment. Best Regards [redacted] @dzwigi24.pl

I'd like to resize an embedded image in an email. The bottom right handle is on the far right side. If I attempt to hover over the handle a scrollbar obscures the handle: it is not possible to grab it and resize the image.

How do I resize large images in Thunderbird emails?

I tried turning off the add-on and turned off dark mode. I have been successfully using it this way, having to change the font color using font/bkgrnd color control. I have not updated win10 or TB since the last time I used this function. I send out daily emails with findings to a group bcc list. Not complex nor variating.

I went to light mode, turned off JonathanKamen's "Send Later" add-on (which is designed and executes well). Process successfully concluded.

Turned back on "Send Later". Still works.

I prefer dark mode. Documenting for advice and to see proactively if some gap is there in code say for error handling.

Thank you, Greg [redacted phone# from community support forum]

I recently lost all of my saved emails and the folders they are in on my laptop computer. They are fine on my desktop computer. I have tried everything to restore them to my laptop computer. (backup option, export profiles, etc) But when I try to restore them to my laptop nothing works and they are not restored to it. I have tried every option that I used to save them but they will not restore. P.S I have tried every option on Google searches with no luck. I am running Windows 11. As a side note I never had a single problem when I was using Windows 10 and Moz Backup still worked. Help Richard Clauser [redacted from public] @gmail.com

I am attempting to add my current email to another computer, it tells me it needs hostname. I enter as I have before but it doesn't recognize. the name is mail.riverbender.com I have setup several email accounts with this hostname, in thunderbird.

I was adding some filters for senders to move emails to my local folders and such, and then I ran the filters. For whatever reason, when I ran the filters this time, thunderbird also seemingly deleted all emails from some of my web email inboxes. The only one that wasn't affected by this inbox wipe was my school email(gmail provider). How can I prevent this from happening again?