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Suddenly I am getting a pop-up window on Thunderbird asking me to sign in to continue with Mozilla Thunderbird email. It populates my email address and after clicking ‘next’ it says.

‘400. That’s an error. The server cannot process the request because it is malformed. It should not be retried. That’s all we know’.

i cannot send or receive through Thunderbird, at present. Who is the genius out there that can tell me what to do?

I bought a new PC in February, backed up all emails and transferred onto new PC. All working fine until last week when windows OS crashed the new PC, managed to re-download Thunderbird and installed everything from back-up USB emails up to February. From February to today no emails have been uploaded in the "local folders". Is there a cloud/ server that stores my old emails in the local folders, so I can recover them, or even a program?

I have been using Thunderbird for years and have never had any problems; unfortunately, from few days, every time I try to download my mail, thunderbird starts downloading all my 15,000 emails, even though they have already been downloaded and read. I am desperate... I don't know what to do. Please help me... thanks!

Emails received in reply seem to couple themselves under the original sent email. How do I tell Thunderbird to treat them as separate, and stored them in my inbox as a separate individual email. Thank for your advice. Kanga85

我的邮件客户端为128.7.1，用的时IMAP协议。在客户端界面显示收件箱（包括收件箱下级文件夹）总共大小为78GB,但是在%appdata%中的thunderbird文件夹却有恐怖的795GB！！！我尝试压缩收件箱但显示只压缩了7.5GB。。有人知道这是什么问题吗？我应该怎样减小%appdata%中的thunderbird文件夹的大小？谢谢。

Hello, Not sure if my first post was published.

Over the last week non of my mails was sent to the SMTP server. I uninstalled the account to start over again.

Upon configuring the mailbox account, the MAPI step was successful.

However, configuring the SMTP server, I am receiving an error: Unexpected end of stream (view image) What is the solution?

I have Comcast as my internet service provider. I use Thunderbird to download a copy of my e-mails from their server and send e-mails out through their server. Until about a month ago, Thunderbird, which I used for many years will not send my e-mails but will still allow me to receive my e-mails. When I try to send an e-mail, I get an error message that says Login to server smtp.comcast.net with username (then my e-mail address).net failed. I had read on Google that Thunderbird was having some trouble and one of the fixes was to uninstall Thunderbird and reinstall it. Also, to check my settings on my computer which I did and nothing has worked. When The message doesn't go through, after this failure message, I then get this message "Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) smtp.comcast.net. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'. I tried changing my password and it did not help. I also contacted the Comcast security team which was able to help me with a previous Thunderbird issue but not this one. They said the problem was with Thunderbird this time. Can anybody assist me with this please?

Just lately, my gmail sent emails are going into trash folder and not being stored in the sent mail folder. In account settings, under Copies & Folders, I have the box checked for to "Place a copy in" and have tried both "Sent" folder and Other "Sent Mail". But the sent messages are not staying store in either of those files.

Most attachments come through as application/octet-stream which I should be perfectly able to view via "gnome-text-editor" or "gedit" etc. I want to be given the option to use one of these.

I don't see any mechanism in the menus to allow this, though. The "application/octet-stream" is conspicuously absent from the content-type list, which is absurd since that's what 99% of all attachments are recognized as.

Note that I want this as an *OPTION* to going through the steps of downloading and then viewing the file.

I installed Thunderbird 138.0 a couple of months ago and was really pleased with its reliability and simplicity. About a month ago, it stopped retrieving emails from our local ISP. After a few very frustrating days of trying to fix the problem myself, I contacted our ISP. They told me that everything on their end was fine, but that I should probably change my password, just in case. I did that and Thunderbird started to work again as usual. About a week later it stopped again and nothing I try fixes it. I can't keep going to my ISP to change my password. The same thing is happening to Thunderbird on my Android phone, except every once in a while, it downloads 20 or so emails, then days of nothing. Its intensely frustrating! Your insight and help would really be appreciated. Thanks, Audrey

Keep getting a message for only some of our email addresses when sending messages. Attached is a screenshot of the message. I have checked the smtp settings and they each have their own outgoing settings and they are linked to the correct user name but some work and some do not. We also are getting an error that requests us to login to yahoo. The yahoo mail popup window opens, we enter the user name and it pops up the Turbify business email popup window (because it is a business email). We again enter the user name and password for the email and it opens an error message blocking the turbify site sayin it is suspicious. We have deleted the email account and then added it back, but it does not solve the problem.

When I receive an e-mail that has a JPEG attachment (Windows 10 Professional 64-bit), Thunderbird opens the JPEG image with Microsoft Photo Viewer. When the image opens, I cannot rotate the image. If I save the image and then open that saved image via the same Microsoft application, the rotate icon in the upper left is operative. Is this due to the permissions in the image being opened by Thunderbird from alt/local/temp? Thanks.

Sometimes I'll get an email that will not open to read. And it is at random doing this.

What I see is this. In Outlook it is shown but will not open. While I get the same email in "gmail", it will open. If I open it in gmail and go back to outlook, it is now open. If I open another email in outlook and then go back to the one that does not open. It will not open again.

Does not make sense, does anyone have a "fix" for this problem? Thanks ahead for any suggestions or solutions.

Shortly after my Win10 x64 ver 22H2 update on tuesday 5/13, my Tbird fails to save any sent message with an attachment to the local sent folder. It is sent correctly and saved with attachment in the IMAP server's sent folder. The same message sent with no attachment will correctly be saved to the local sent folder as it should. In both cases the message "saving to sent folder" is displayed. The TB version was just updated to 128.10.2esr (64-bit) and issue continued as before. PC restarts make no difference. SFC system scan finds no issues. Had no issues with this PC & TB over last 5 years until now. Issue is annoying, since I frequently use the local sent folder to forward messages to additional recepients.

Hi I have been used to Thunderbird responding to my beginning to type recipient names with a list of matches. Suddenly it has stopped doing so. I have checked that all my addresses are still present in the Address Book (relief!), but I note that the Contacts sidebar is completely empty (even the Address Book options are missing). I can't find a setting to correct this, and would be very grateful to know how to revert to the previous good performance. Thanks