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I would like an apple (icloud) account to thunderbird, but it doesn't work the automated way. I changes password and made sure that account data and password fit. Anyway I got an error message and wasn't able to connect. I had no issues with outlook and the apple account, so I'm wondereing what I need to adjust or add. I want to finally switch all my accounts and systems to open source and getting them connected is my first step. Any help would be appreciated. - Thanks in advance!

Hello,

for some reasons I need to downgrade a TB installation (Mac silicon 148.0.1) to the ESR channel, 140.8.1esr for Mac silicon.

I read articles in the KB where Mozilla discourages this, but I would avoid to move 15Gb circa of emails by hand copying and pasting them...

So is there anyone that has tried this before? Any suggestion how to do it without loosing e-mail in th process?

Thanks fr your support.

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?

Hello, so I have Thunderbird installed on 2 Windows 11 PC's both are updated and operating with all updates! On my 1st (main) PC which I use 98% of the time Thunderbird has been running perfectly with IMAP and Oath2.

Last night on the 2nd PC I rarely use I opened Thunderbird and it started to download messages for awhile and all my 2026 up until OCT 2025 disappeared?

I logged into Yahoo Mail from a browser and yup all gone?

I sent a deleted by accident request to YAHOO and today all my mail had returned when I checked on my 1st (main) PC.

I started the 2nd PC and all was good, till it started downloaded messages again? And POOF right back to square one?

What's happening? Should I confirm that IMAP and OATH2 are enabled on that PC before I do something else? I've sent another DELETED request to Yahoo and at this point I'm thinking to just REMOVE Thunderbird all together on the 2nd PC.

hello, i cannot seem to find a solution online, hopefully someone here can help.

i often receive emails with images attached, and most of the time people don't resize the image. so you can imagine over time this all adds up. i dont always need to keep a 6mb image versions. i would love if there is a way to resize the email image attachment, to at least still have a smaller copy for refence, but not end up with a huge email account (local/pop3)

preferably a one click solution, or even a routine i can run on the file system, etc.

thanks

I have made no changes to the PC or mail midway through the day it suddenly said input password, the password is correct, but I get incorrect password message. The password works using browser mode.

For some reason I have lost all old emails in my inbox. I am only getting new messages, but I have many Thats I leaving in my inbox to address later. Please help me to recover them. This hspppen on or about a March 4, 2026

Since the firefox upgrade of March 4, 2026, I have lost all of my old emails in my inbox. These are important items I need to work on before I complete and file away. I need to gain access to them ASAP. Thank you.

When I try retrieving my email from my AOL account (IMAP) using Thunderbird and Windows 11 I get the message "Authentication failure while connecting to server imap.aol.com." This account was working fine for months until the T-bird update. I have several other accounts on T-Bird, including Gmail and others, and they're still working just fine.

I have double-checked all the account settings and tried deleting the AOL account from T-Bird and setting it up again from scratch, but the problem persists.

Please help!

Many thanks.

My friend Ken has been using Thunderbird successfully for a long time. in the last 2 weeks, yahoo popups have shown up that prevent Thunderbird email usage. How do we get rid of them?

I would like to know how I can control the timing of compacting the mailboxes under Linux and Windows. The reason why I ask is that every time compacting needs to be done, the prompt to do so comes up as soon as the Thunderbird interface finishes loading but before all of the mailboxes are finished updating,which can take several minutes. If I accept the compacting, it inevitably returns an error that it could not run because the mailboxes are still updating. Or I can cancel until I go through this the next time.

It would seem like a simple matter to either give the user a way to delay the compacting process, or have Thunderbird not initiate it until it is safe to do so to begin with.

I have tried to research this but have not found any answers.

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?

For some time now my primary email address gets wiped clean every night and is empty every morning. I have to transfer received mail to another input address to keep it safe!

Hello,

I love Thunderbird, but I have recently moved to use a Android device for most of my work, and despite that there is now Thunderbird for Android, I found that there is a feature I really need but it is not working there: moving mails across different accounts. I work daily with four different accounts and sometimes I need to move some threads from to another. I had to move to a different email reader because of that, but I would really love to come back to Thunderbird.

Best regards, Patricia.

I'm able to add an e-mail account but when I go to add a second e-mail account, when it looks up the information, it just hangs with the circle going around.

This is true for two different user accounts on the same computer.

I've uninstalled and reinstalled Thunderbird but it didn't help.

Thunderbird can't be exited without killing from the task manager or shutting down.

I find TB spam filtering pretty weak. As one example, the same spam email can come in multiple times, be marked as spam each time, yet never be caught by TB. I'm running behind - currently using release 115.18.0 - I have had no reason to upgrade until now. My question: If I update is spam filtering improved?? thx,

Currently my Thunderbird 'Sent' mailbox is only holding emails back to the beginning of 2025. However on previous PC's my Sent mail went farther back, but not I think to the beginning of when I bought the PC. I do backup my PC with some regularity but I am wondering whether there is a limit to how far back Thunderbird saves messages. I've been using Thunderbird for about 20 years and wonder whether I can retrieve some of my great emails :)

I deleted my Thunderbird account and created a new one on the same computer. I used a Profile saved on my external hard drive. The address book info was replicated. The hierarchy of folders and their emails were not replicated in the left hand pane. Is there a way to retrieve those folders with their content? Please, I am not super techno-savvy, so take me step by step. Thank you.