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I have been using Thunderbird with two POP3 Hotmail accounts for some time and I am trying to set up a third account with exactly the same configuration. However, both the automatic and the manual configurations failed. The new account receives mail, but the outgoing smtp server config seems to have a problem. Sending messages times out or keeps prompting for a new password.

The Hotmail account has POP3 and IMAP enabled. Thunderbird is set to receive all cookies. I cleared history and cache after every attempt and also temporarily disabled the firewall.

Any suggestions about what the problem could be?

For the last 2-3 day I have been experiencing a box that asks for my signature each time I go to a new website. I can't move the box. I can't screenshot it. Does anyone know how I can get rid of it?

After i installed firefox net jitter somehow appeared in my cs2. every time i play jitter is jumping randomly. Can yall somehow fix this i really enjoy using this browser but i just cant play with it running in the background((((

Dear Support Team,

I am writing to report an issue I am experiencing with Thunderbird. Every time I use Thunderbird, an attached error message keeps appearing. This problem is delaying my work and affecting my daily tasks.

I kindly request your assistance in checking and resolving this issue as soon as possible. Please let me know if you need any additional information or screenshots of the error message.

Your prompt support would be greatly appreciated.

Thank you

Hello, when i put a message in the garbage can, thundirbird open immediately a new message. sometimes i think that the new message is the old one and i put it in the can without reading it... So, i would like that thundirbird does not open a new message when i put one in the garbage can, i want it open a message only if i clic on it manually, not automatically. Is it possible in the settings ( i have not found)

thanks.

Importing CSV address books does not work properly. The resulting folder cannot be accessed by emails to be sent.

The imported Address Lists cannot be used in an email as a list. The error message is that the address is not a valid email address. However, if a new Address List is created with the contents of the imported file manually copied, then it can be used as an email address.

I also found that clicking on an individual address in the imported csv, will open the individual email address.

So the addresses are valid but the list is corrupted.

Hello,

I downloaded all my emails from my .com mailbox into Mozilla Thunderbird. I could see all of them for about three days, and I was very happy to have them stored locally, as I am planning to move my mailbox elsewhere.

However, today all folders appear empty in Thunderbird and I can no longer see the emails, even though I can see that the files are still stored on my computer.

I have been trying for hours to solve this problem with the help of AI, but without success.

Could you please help me restore or display the emails that were downloaded locally?

Thank you very much for your help.

Best regards, Michaela

Four accounts: Rogers Yahoo, Office365, GMX, and a second Yahoo account

When Thunderbird recently asked to access to my provider's server, I gave my Rogers Yahoo account and password; everything looked fine. But when I tried to use my second Yahoo email account, all the folders contained the same data as the Rogers Yahoo account, even though the email addresses were different; my original emails were gone from the Inbox and other folders.

So I began to follow the instructions in Mozilla's page "OAuth2 Authentication for Yahoo, AOL and ATT". 1) with Config Editor, changed "mailnews.oauth.usePrivateBrowser" to TRUE 2) checked for "Accept cookies from sites" in Privacy & Security settings 3) checked authentication settings: All Outgoing servers were set to "OAuth2", as well as Yahoo and Office365 incoming servers. The GMX incoming server was set at "Normal Password" with no option for "OAuth2". 4) I am in Canada and do not use VPN. 5) Finally, I deleted the second Yahoo account (tc2002ca) and all its data from Thunderbird. I logged into Yahoo! Mail online to make sure I had the correct password. I then added tc2002ca as a new account using manual configuration. I entered all the settings to match the Rogers Yahoo account, except (of course) the password which was associated with the tc2002ca account. The result: same as before - all the folders of this account were identical to the Rogers Yahoo account.

To summarize, all the settings in the two Yahoo accounts were the same (imap.mail.yahoo.com and smtp.mail.yahoo.com) except the passwords. When I "tested connection to server" in each case it came back "Successful". Please help me get back to having two Yahoo accounts in Thunderbird, as I have had for years. By the way, I have had no problem using SeaMonkey in a similar way. Thanks!

Using Acronis True Image for Western Digital (ver 2025 build 41936) to backup my files on a daily basis. Recently the backup program has been stopping and reporting that it cannot access some Thunderbird files, even when Thunderbird was not running (1st image) I tried 'Compacting all Folders' in Thunderbird but the result was the same (2nd image). Lastly, I tried clearing the cache - the result is the same. In all cases Thunderbird was not running during the backup.

i realize that this is not a Thunderbird issue, but I've been unable to get help elsewhere. I wondered if anyone might have a solution since Acronis apparently sees the file as being accessed - is there a way to remove that?

I made a folder and saved emails in that folder. A few days later they were all gone, empty folder. I followed suggestions on here, did the repair, erased password and replaced it, did the subscribe, and now even the folder is gone. I spent hours trying to research this and repair it and now I have nothing.

I had about 15 pinned tabs - unloaded - that I was saving for a research project. I shut my PC down and when powered up for the next session - all the pinned tabs were gone. I never thought to record the tabs via screen shot or something.

Is this normal - what are the limits of pinned tabs ? Do they expire in a day ? When the PC powers down ? When Firefox updates ?

Exactly what are the limits or boundaries for pinned tabs ?

I just accidentally deleted a day of history, now it has to relearn a bunch of stuff.

Please add support for undo, so that if you do it by accident, you can reverse it.

I get this error ALL THE TIME from TB. Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) smtp-mail.outlook.com failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again. Copilot says that TB is NOT recognizing my personal Outlook email account as a viable SMTP account. Been on line with Copilot for couple of hours without success. Does anyone at Mozilla have anything to offer me?

During the week of March 7-13, 2026, upgrade(s) caused the size of my bookmarks, fonts and tabs to shrink to barely readable (see attachment) in the Firefox browser window on my Windows 11 PC. I've tried every internet base advice article. How do I increase the size of them?

While this may sound silly, it does happen that I add bookmarks, but I might rush and forget to update/change the bookmark folder/path where to save it when I am in a hurry (and the page might end up saved, but not in a location I want, say, a news article that should be saved in "News" might end up in a "Development" bookmark path or vice-versa, depending on which path I last used to bookmark a page), or even forget where I saved it (if I did it some time ago for a "read/use/check/update later" type of thing and it is a generic article - and yes, I even have a "TODO" bookmark "directory").

While the Bookmarks windows dos have a search option (thank god!), it doesn't also show where I saved said bookmark (so that I can move, delete or do whatever to it). So please, in the Bookmarks window also add a column with the path where it is saved (obviously hidden by default), along with the URL, name, visit count, etc. I am sure code-wise, the effort is negligible, but it can help so much.

Hoping this comes true (*fingers crossed*), thanks in advance!

Thunderbird was running on a laptop that has become suspect. Copied the files to a desktop machine. Tried to access these file from the app on the laptop. Only new message are available. All old inbox, sent, other folders, trash, etc. are missing. Tried to go back to the laptop files, but the results are the same.

Running Windows 11 on both machines.

Is there any way to get my data back?

Thanks, Robert