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Something seems to have changed recently with the PDF rendering in Thunderbird. I received an email with a PDF file attached. When I view it on the screen it looks fine, but when printing it out from within Thunderbird part of the top of the first page missing; it looks like part of the image is behind a white rectangle.

When I save the file and print it using Acrobat Reader it renders fine.

I don't know what to make of this behavior, but it does seem to be new and there is a difference between how the file is printed from Thunderbird as opposed to printing using Adobe Reader.

Thunderbird 152.0.1 on Windows 11 PC.

I'm using Version 128.6.0esr in Windows, but can't do drag and drop file for attachment at all. Previously it still can use this feature but suddenly it came to a stop.

The icon Ø will appear when we are trying to drag and drop a file to the create message window.

We already have tried the troubleshoot with no result.

Any advice on how to repair this?

Thanks

Thunderbird Version 142.0 will open when I chose a file to send to mail recipient using win 11, but the new email screen doesn't open so no file attaches. All my defaults are correct, there is a proper mail recipient entry in the appdata sendto file and there is a key in the registry for Thunderbird under client mail.

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.

I am an experienced TB user, but at the moment at a total loss for a solution to my problem.

I use Windows 11 Pro. When trying to click on image attachments for PNG and JPG/JPEG pictures, the behaviour is different: PNG images are displayed just fine in the Windows photo viewer, JPEG images are not. If I open the same images via double-click from the local disk, both open just fine in the same viewer. I have checked the file type settings already and even changed them to always ask me for JPEG images. I get asked just fine and see that TB wants to open the Windows photo viewer for both files types, but while it works for PNG, it does not for JPEG. There is no error message, just nothing happens, at least nothing visible to me.

When trying the same from a new user profile, it works as expected. I tried TB safe mode, deactivating all add-ons, but it still does not work in my main user profile.

I would be glad to receive hints for how to solve or at least debug this. Thanks in advance.

Hello,

I am running Thunderbird 140.1.1 esr on a Win 10 Pro laptop. In the past, when I inserted an image into an email, Thunderbird offered to resize that image. Now, it just inserts the image, even if it is very large, and doesn't give me that option anymore. So I need to first resize it before adding it.

Is there a setting that will allow the resizing, or has Thunderbird changed how it handles inserted images. I tried the "Advanced Edit" option, but those changes don't "take" and the image is inserted as is.

Also - when I do try to add an image - the inbox becomes the primary window and I need to "find" the compose page to see the email. That didn't used to happen either.

Thanks for any help!

TN

Drag and Drop attachments to the desktop stopped working again with Thunderbird 145. Steps to reproduce: You receive a mail with an attachment. You drag an attached file from this message and drop it onto the desktop of your Mac to download it. The attached file is not saved to the desktop (or any other folder I tried). This is on MacOS 26.1 MacMini M4. Please fix asap.

Is there any way to get Thunderbird to display attachments in the body of an email message rather than in tabs underneath the email? There is a "Display Attachments Inline" option under "View" but attachments are in tabs whether that's checked or unchecked. I am coming from Mac Mail...and am used to seeing the attachments in the email body itself before I grab them and drag them to my desktop. They only appear as tabs in Thunderbird.

This is just a curiosity. When I attach files to TBird emails it always shows the size of the attachments. When the attachments are large enough, I get a warning asking me if I really want to send them or if I should use a file sharing app. What I find curious is that the warning always shows a file size substantially larger than what TBird does. For example, today I wanted to share a file the both TBird and my Win file manager said was 32MB, but the warning said I was trying to send a file that was 48MB.

Why is that? Does TBird have additional data it attaches to the sent message that increase the file size substantially?

I had put this up on all the mozilla firefox forums, putting up again, cause it remains unresolved.

Dear Thunderbird,

I have been using Eudora for 20 plus years and migrated to Thunderbird after Mozilla took it over. After my donation, I have observed that the last update that you have done, has a bug.

I would always detach any attachments on my email and categorize them in my set directories for easy retrieval and I have these files since 1991. Off late when I detach a file it deletes it from the email, and saves it to my attach folder, desingated in the options menu, making my inbox file that I backup smaller and managable on a pen drive too. Now when I detach files, it deletes them from the email but the attach directory is always empty.

Please rectify this as it is causing a lot of files being lost.

When T-Bird sends a message with an in-content photo, is that photo compressed to save space and transmission time?

I converted from Eudora. Eudora would compress in-content photos to save space and transmission time.

If T-Bird performs a similar action, is that compressed file saved somewhere?

docx and xlsx attached files don't open with I click on them. I want them to open in Word and Excel. Nothing happens. I have to save them to my Desktop and then I can open them.

doc and xls attached files open when I click on them.

I can't find any associations in "files and attachments". 

I'm using version 140.7.0esr (64-bit)

Не отображаются картинки в теле сообщений Настройка "Показывать вложения в теле сообщения" включена

При просмотре сообщений в списке отправленных писем, либо при получении внешних писем со скринами вставленными в тело письма не видно картинок в теле сообщения, все картинки переносятся в приложенные документы с наименованием из хаотичных символов, и также не видно какой из этих файлов в каком месте сообщения вставлен.

Просьба помочь разобраться

Версия Thunderbird - 140.1.0esr (64-разрядный)

My Thunderbird install updated from 140.13.0esr to 153.0.2esr yesterday and now I can no longer drag and drop any attachment from an email to any folder on my computer. I simply get an error message window with a title of "Error Moving File or Folder" with "Unspecified error" text. See image attachment.

I've tried a variety of folders, including Downloads, Documents, Pictures and other folders on local and external storage devices.

I can save the attachments using the Save All button, or by right-clicking a file and choosing Save As, but not by dragging and dropping as I have done so for years.

I have checked if Thunderbird is running in admin mode, which it is not, but have tested it both ways with the same problem occurring. I have also run Thunderbird in Troubleshoot mode, and the same thing occurs. I tried clearing the startup cache from the troubleshooting page with no change. Restarting the PC did not resolve the issue, and disabling my anti-virus(Avast) also did not make a difference to the issue.

Hello from France,

I own a Canon Maxify print "Ecotank" and a brand new computer Dell Windows 11 22H2.

Thunderbird 128.6.1 esr x64 has been installed

I meet a problem :

Despite Thunderbird is set by default in Windows, and into IJ Scan Utility "Thunderbird" is set by default too for email directly after scanning a document, Thunderbird opens but with no new window "New Message" as it should be !

Before, i used to open IJ Scan Utility, select "email" , document was scanned and Thunderbird opened with a new window ready to send the message with the scanned document joined.

Can you help me please? Thanks a lot for reading.

TB in WIN11. Right click on any file. In Win10, there was a "send to" option. In Win11, there's a "share" option. To send a file directly, select "show more options." The older version's menu will appear, and it will say "send to -> email recipient." Is there a way to generate an option to send files faster? When the file sending window appears from the file manager, the cursor in the message writing window doesn't move to the address field (as it does when composing a new message) but somewhere else. This is quite strange, because you automatically start typing the recipient's address, but it doesn't appear in the program. This is probably more a system issue than Mozilla's. Perhaps a registry entry or other action might work. Perhaps the submenu after right-clicking on a file, or the icon at the top next to "Copy, Paste, Cut" or in section share it.

I am trying to send a message with lots of MIME attachments from Thunderbird. After I click "Send", I get this error message: "Number of MIME parts exceeds maximum permitted". Unhelpfully it does not say what the maximum is and I cannot find this information in Support.

I have uploaded an image of the message I get. I have 100GB of free disk space on my C drive where my Thunderbird programme is and 531 GB free space on the drive where I keep my Thunderbird profile - with all the mailboxes and archives. Windows 10 desktop computer.

Anyone know what the maximum number of MIME attachments to an email is? Thanks in advance

Hope someone can resolve this "Thunderbird mystery" for me.

I just sent an email to 9 people. The message was a few paragraphs and would normally be 8.6 kb in size. (I know because I copied and pasted the body of the message into a "test" email, and TB showed 8.6 kb as the size.)

My message included an attachment of 58.0 kb in size. [It also included 3 links, but those shouldn't contribute more than a miniscule amount (just the actual letters in the link) to the size, right?]

Yet when I sent the message plus attachment (and copied myself), Thunderbird showed it as 5.3 MB (!) in size.

How can that be? Any help would be appreciated.

Andrew

Dear Thunderbird,

All attachments used to save on a folder when it was detached before. Without any changes done, just on updating the Thunderbird software, the attachments now detach and delete from the email, but when I check the same folder there is no file detached and saved there, while the file gets deleted from the email and lost forever.

Have put this on many forums as well as bugs but no respite, please help Mozilla, FIrefox and Thunderbird team.

This was my post on the other Mozilla forums: Dear Thunderbird,

I have been using Eudora for 20 plus years and migrated to Thunderbird after Mozilla took it over. After my donation, I have observed that the last update that you have done, has a bug.

I would always detach any attachments on my email and categorize them in my set directories for easy retrieval and I have these files since 1991. Off late when I detach a file it deletes it from the email, and saves it to my attach folder, desingated in the options menu, making my inbox file that I backup smaller and managable on a pen drive too. Now when I detach files, it deletes them from the email but the attach directory is always empty.

Please rectify this as it is causing a lot of files being lost.

I got an email with a dozen or so mp3 files attached and wanted to download them in one go onto my android phone. I chose "download complete message " thinking that would work. But no. The files don't appear in the downloads folder so I'm going to download each one separately. But I'd still like to find where the "complete message" was saved so I can delete it. Regards, Ian