Thunderbird Community Forum

I've recently started having an issue where emails sent from my email account are being delivered, but some of them are ending up in the recipient's spam folder.

I'm using Thunderbird and the account itself appears to be working normally. I can send and receive messages without seeing any obvious errors.

I've already checked the SMTP settings, but I'm wondering if this could be related to my domain's email authentication rather than Thunderbird itself.

What should I check for SPF, DKIM, and DMARC, and is there a good way to determine whether the problem is with Thunderbird, the mail server, or the domain's email configuration?

Since reinstalling Thunderbird and Firefox, When i get an email in my Thunderbird email listing, clicking a link does not open it so I have to copy it and open it in Firefox.

Dzień dobry, Zgłaszam powtarzający się błąd w programie Thunderbird. Mam problem z drukowaniem załączników w formacie PDF bezpośrednio z okna wiadomości e-mail. Opis problemu: Podczas próby wydruku załącznika PDF, w oknie podglądu pojawia się czarny ekran z komunikatem, że aplikacja nie obsługuje podglądu. Po kliknięciu „Drukuj”, drukarka wypuszcza całkowicie puste, białe kartki. Środowisko: System operacyjny: Windows 11 Drukarka: Canon MF450 Series UFR II Ważne informacje: Drukarka jest w 100% sprawna. Drukowanie tych samych plików PDF po zapisaniu ich na dysku (przez przeglądarkę, Adobe Acrobat) działa bez najmniejszego problemu. Problem występuje wyłącznie wewnątrz Thunderbirda. Co już próbowałam zrobić (bez skutku): Uruchomienie programu w trybie rozwiązywania problemów (Safe Mode). Czyszczenie pamięci podręcznej (cache). Resetowanie ustawień profilu drukarki w Edytorze ustawień (usunięcie parametrów print_printer). Wymuszenie systemowego okna dialogowego przez zmianę print.prefer_system_dialog na true. Wyłączenie zaawansowanych funkcji drukowania w sterowniku Windows i zmiana trybu na rastrowy. Wygląda na to, że wbudowany silnik czytnika PDF w Thunderbirdzie przestał poprawnie komunikować się ze sterownikiem Canon UFR II. Będę wdzięczna za zbadanie tego błędu i pomoc, ponieważ drukowanie bezpośrednio z programu jest mi niezbędne do codziennej pracy. Z poważaniem, Alina

Afrihost is my service provider and emails are accessed via a webmail page. The size and functionality is limited and I use Mozilla Thunderbird on my laptop with Windows 11 to save emails in local folders on my hard drive. I can't do this via webmail and my backup changes between Thunderbird and the webmail page. Yesterday I cleared my inbox to local folders in Thunderbird but am no longer receiving emails there. My old and new emails can still be seen in the webmail inbox, I don't know if I've exceeded some limit and I don't want to lose old emails in my local folders. Personal, low volume use only

Hi, I'm trying to move from outlook and use thunderbird. But every time I try to login using my outlook email account I get an 'authentication error'. I tried to look online for the solution, but haven't found it.

Anyone able to help

Hi all I have recently installed Thunderbird on a PC that didn't have an mail program. Its Win 11 and includes Malwarebytes and Norton 360 for security Thunderbird 154.0, (64 bit)

I followed the set up as I have done many times before and previously had no problem. I am using Plusnet and have set incoming mail as POP3 on port 995. I have set outgoing mail to SMTP and port 465 ( plusnet recommended 587 doesnt work at all) I have set my login name and password. Security is SSL/TLS

Incoming mail is received normally Outgoing mail asks for my password as on attachment Entering a password doesn't work and results in another error message

Any suggestions? Cheers Keith Keith

Any suggestions

I want to sync calendars across Thunderbird and iPhone. (Linux Mint 22 Wilma, Thunderbird 140.14.1 esr)

I am trying to use the Apple calendar server to sync with. Using the Create New Calendar dialog box in Thunderbird, then applying the Apple-assigned password, Thunderbird returns "Could not find calendars at this location. Please check your settings."

I would appreciate help with this.

I'm using Thunderbird v128.8.1esr. Over the last week or so, suddenly it stops auto-downloading messages. When I try to manually download by clicking "Get Messages", nothing happens. I had to reboot my machine to get it working, but yesterday it happened again and restarting the application allowed me to download.

送信したメールは「送信済みファイル」に残っていましたが、急に残らなくなりました。 サイトを見て「送信済ファイル」のフォルダ名をsentに直そうとしましたが変更できません。 フォルダのアイコンは紙飛行機ですが、フォルダの名称の問題でしょうか。 また、設定→アカウント設定→送信控えと特別なフォルダー　の”返信元のメッセージと同じフォルダに 返信を保存する”にチェックしましたが、それでも残りません。 対処方法をご教示ください。 よろしくお願いします。

I use IMAP to grab my mail, if that's important.

In the last couple of days, my normal method of deleting messages from my Inbox, right-clicking on the message and selecting the trash can icon, has stopped working: the message disappears for a moment, then reappears. I can delete it by dragging it to the Trash folder in the folders pane on the left.

I've followed the instructions given in several postings here, including deleting the Trash and trash.msf files, doing that and then creating an empty txt file called Trash (no .txt), and using Repair Folder.

It just now occurred to me to disconnect from the Internet and try to delete a message. It worked fine?!

Suddenly since Friday 21.08.2026 morning every single person in our company started to call the IT department that their Thunderbird client is printing out blank pages (white pages) instead of attachments from emails.

What is happening -> Employee gets email with PDF attachment -> clicks to open it in thunderbird print preview -> prints -> blank page comes out.

What works -> Downloading the PDF and printing it. Opening the PDF in any other browser than Thunderbird and printing it.

No settings or updates were changed and it's a big issue affecting multiple computers.

What I tried doing -> Trying different printer (No fix), Resetting print settings in thunderbird (No fix). Trying other PDF attachments from older emails (No fix). Looking at print settings in windows (Which I didn't change since it only doesnt work in Thunderbird).

Problem is that on thunderbird in my office, This doesn't happen. We have the same versions and settings.

I tried opening the error console while opening the PDF and on computers where it doesnt work it shows me an error with along the lines of "This document is open in compability mode due to **** header <doctype html>" Something like that but i would have to check again.

I don't get this error on my personal PC.

Edit: Just saw it was already a known issue: https://bugzilla.mozilla.org/show_bug.cgi?id=1959171

I've found out that on both Linux and Windows since the last update (154.0), the PDFs printed directly from the Thunderbird PDF viewer, prints out blank PDF.

To recreate this, open a PDF attachment in an email, simple double click on it, in the top right corner on the tool bar, press the little printer icon, choose either "Save as PDF" or print to the actual printer, in both cases, you will get one blank PDF page.

Sometimes an email I receive contains text whose right margin and text is chopped off. I thought this was because the emails were formatted for Google's gmail, but I just received an email from Thunderbird itself that is truncated this way. What's going on?

I'm enclosing a screen shot. I can also send the .eml file if that's helpful.

This past week I started having a problem accessing URL's embedded in my emails from the Thunderbird interface. When clicking on the URL reference, nothing happens. I have not changed anything in my settings recently. Running Windows 7. I know my email server is working since this works when using my AT&T mail handler. I did have an issue with a Trojan virus that was cleared up with Malware program (i hope). I checked all the parameters of my mail handler and saw nothing that might cause this problem.

Block advertisements in my emails, I hate this advertisements they pop up everywhere, when I type subject in my emails instead of to appear the subject contect the gambling advertisements will pop up it is very frustrating

Hello,

I hope everyone here is doing well.

I am trying to change from Gmail to Yahoo.

I am using Thunderbird to migrate my Gmail account's emails to my new Yahoo account.

My Gmail account has thousands of messages, including numerous photos and other attachments.

My laptop doesn't have space for the app and everything necessary for the migration.

How can I use the Android app on my phone to accomplish this instead?

Please let me know as soon as possible.

Thank you so much!

Hi, I have been a Thunderbird user for many years and have over 16,000 emails in my account.

Today when I launched TB it comes up with blank screen with No Response on the top left. See screen shot image upload.

I have tried launching with Thunderbird -P and it only shows default account named default.

- other places show 3 accounts with one having -release

--Users\myuserID\local\Thunderbird\profiles:

   9qflpwnsdefault
   8593y64.default-release
   fsomy6as.default

--Users\myuserID\AppData\Roaming\profiles\ shows the 3 listed above.

I have tried launching Windows 11 in Safe Mode, same issue. I have tried the Troubleshoot Tool with same result.

Any ideas on how I can get TB to load correctly and show me my emails?

Please let me know if you need additional information.

thank you, George