All Products Community Forum

I have been using Thunderbird for years for email accounts with Comcast (Xfinity), Yahoo, and gmail. Yesterday, I started having a problem with my Comcast accounts - when I sent a message, it went out, but I got an error message (attached) saying it couldn't save a copy to the Sent folder. Sending messages from my Yahoo account works fine. Sending messages from my gmail accounts, I get _two_ copies in the Sent folder (this is new).

I tried restarting my PC, and that didn't help. I tried Troubleshoot Mode, but that didn't help. I tried reinstalling Thunderbird, and that seemed to fix it, but then it started again. I tried compacting the folders, and that seemed to fix it, but then it started again.

I can connect to the Comast/Xfinity server fine, and things work. If I send an email from the server, a copy goes in the Sent file, and it then shows up in the Sent folder on my desktop. But emails that I send from the desktop don't show up in the Sent folder.

I am using a Dell XPS8950 with Windows 11.

Thank you for your help.

since last update my *All Mail* folder is empty but at the top it says there are 138,944 messages. I can use some filters and SOME messages appear but by far not all that should match that filter. any clues? thanks,

Thunderbird 140.6.0esr (aarch64) on a Macintosh using Tahoe 26.1

I was working on my email accounts when the messages in the inbox of one of my email accounts disappeared. The message count on the top left of my inbox display says 0.

How do I get them to show up again.  I am using Thunderbird on Mac OS 15.6.1

All of my previously read emails are still highlighted. The number of "new" emails in the count continues to rise, when I have seen them all. How can I shut that off so I don't think everything is a new unread email?

Ever since thunderbird did its major upgrade to include encryption some years ago, when it resulted in my address book being lost, I've foung thunderbird harder to use, Emails get downloaded 2 znd 3 times over so I once had 40,000 emails in my in box the vast majority duplicates. After deleting most of themI was dismayed to have the double and triple downloading continue. I now the email on my angroid phone far more than Thunderbird because of this, sometimes when drafting emails the message screen goes god knows where when I go to find add address from my address book, There is yet a straight forward to rasily increase and decrease the font size in received emails. As my eyesight fails thay's an important omission to have to work around, Firefox has an app that adds buttons to increase and decrease font size, simple. Never understood why Thunderbird didn't have somwthing similar, Much more convenient than have to stop and search for my glasses,

I think a back to basics approach to Thunderbird rather then adding bells and whistles that may ne nice buy seldom used, I just learned gmail allows you to retract emails. Yhat's a feature that I will lead me to at least explore gmail. That's mt 2 cents,

don't misunderstand me I've used Thunderbird for over 20 years and would be very re;uctant to leave it,

                                                                   Andy Strojny

Every time I open up Thunderbird email I get a message box which pops up saying " Sending of the Message failed An error occurred when sending mail. Were sorry but we cant send your email. etc, etc and "Please check by sending it again(6-1-1-2)

ID (68CA1CA0089AF165) please check the message and try again"

How do I find this message ? When I look at sent items in my mail , I have sent nothing and I am not aware of sending anything.

Hi everyone - and big thanks in advance for considering my request: I have/ had windows 11 on my old machine and windows 11 on my new machine; because my 'old computer' is not running anymore at all (liquid damage), I can no longer start Thunderbird and follow the 'export tool function' (https://support.mozilla.org/en-US/kb/thunderbird-export) and thus can only do the manual transfer (https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer); I didn't think that I would need to go through the export tool steps when I saved the Thunderbird profile folder regularly as backup on the cloud; yet when I started Thunderbird on my new machine following the above steps by moving the Thunderbird profile folder manually, the result is that - although Thunderbird is 'running' and the mailbox is functioning properly - the key folders are empty (i.e. the sub-folder structure is completely lost, in fact there are no individual emails at all); the issue seems to be that the size of the Thunderbird profile folder is too large (the "Profiles" folder has a size of 20.5 GB) for doing this transfer via copy & paste of the Thunderbird profile folder from the cloud (I also tried USB) to the new machine; I understand that the size issue via the manual transfer could be 'overcome' just by starting Thunderbird on the 'old machine' and following the above steps explained under mozilla support; yet that's no longer an option; what could I do please?

I am using 140.6.0esr (64-bit) and Windows 10. My Inbox disappeared. I was in it with no problems. Then I noticed two problems. I couldn't open new emails. It said connecting to server or loading content but email was blank. Also when I sent an email it could not copy to my sent folder due to network or file access errors. I could open and read all the other emails in my Inbox, just not three new ones. So I selected Inbox properties and repair. After the repair, my inbox is completely empty. It had thousands of messages. When I do a search for common emails I know were in my inbox, it only shows emails from subfolders. When I go to Inbox properties, it says number of messages: 0

Is there any chance I could talk with someone? Or that someone would call me? I'm not experienced in Thunderbird or email settings. And I don't like having to do it online. Richard Higgins Concord Mass

Bonjour, Je reçois des mails d'un même site, certains sont cliquables, d'autres non. Si je les lis avec orange, tout est ok, sauf avec thunderbird. Que dois faire pour continuer avec thunderbird. Merci pour votre aide

I was helping my hosted email provider track a phishing email and I had to turn on my headers in my emails so they could track the source of the email. Now I need to turn off the "Display Header" setting and I cannot locate it.

How do I make Thunderbird, just forward the email without the full header?

Thanks in advance for the assistance.

Hello. We changed from the ESR channel to the regular release channel today by installing Thunderbird v146.0 (regular release version) over the top of our existing installation (which was the ESR version). The installation went fine and everything appears to be working perfectly. My only question is why the name of the profile didn't change. It still has a name of 'xxxxxxxx.default-esr'. I would have thought that the name would be changed to 'xxxxxxxx.default-release'. Is this something we should change, or should it be left alone. Thank you very much for your assistance.

I have been using Thunderbird for a few months and changed my Google Password(even though Im not quite sure if the error wasnt already occuring before that), but now when I go on Thunderbird it gives me a popup window that says "Enter credentials for name@gmail.com on imap.gmail.com". Theres a field for the email-adress, but when I click "Next" theres the following error: "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."

These are the things I tried: Entering the old or new Password. Checked if the config is set to OAuth2 in both incoming and outgoing servers and enabled on Gmail-Account. Deleted and tried to (unsuccessfully) reregister my Thunderbird-Account. The same error pops up when it checks my password after the configuration.

I dont know if the password change is actually the cause, since I think I remember the error message appearing earlier today, before I changed the password, but Im not sure. Also, I have another account linked to my Thunderbird, with no changed credentials, and while there is no similar error message, thunderbird suddenly also has problems connecting to it and asks to retry a few times (3-4) before actually connecting everytime I open it.

hi, if i sync 2 t/bird installs which one will install its personal data on the other pc?. the same question also applies to my f/fox install if anyone knows

win 10 tb145.02

thanks very much if anyone knows

Díky za odpověď, Bohužel systém mi nedovolí zaznamenat hesla jednotlivých účtu, pro zobrazení vyžaduje hlavní heslo. Existuje postup pro změnu hl. hesla, bez jeho znalosti. Díky za odpověď. Mielec

"save all" to save attachments stopped working. I tried selecting all and Control C to copy them, and that did not work either. Often need to save multiple attachments since I work from home.