Thunderbird Community Forum

hi i went to create a folder in one of my emails which i did, but didnt see i spellet it incorrectly so i tried to rename it but it didnt rename instead it created a new folder with the correct spelling, i tries to delete the wrong one and i couldnt delete it, i moved the emails into the folder with the correct name and it moved into both folders which now doubled the size of the emails i had in the folders or thunderbirds database so i tried to delete the emails in the wrong folder and it delete all the emails in both folders but the folder stills the folders still the emails that where there but i cant see them and i cant compact the folders to save space

When I accessed TB it updated to an ESR (Eclipse) version and when I load it I get a message saying I've used an old version, would I like to create a new profile. ( I didn't) I've copied my backup to the profile but many folders are missing from the current profile.

How do I get all my folders to display? I've reinstalled TB version 147 without the ESR option.

My old email server was Mediacom (mchsi.com). I had that email account plus a gmail account on Thunderbird. Sometimes people said their emails to my gmail account would bounce. I changed email servers and no longer have the mchsi.com email or Mediacom server and have 2 gmail accounts on Thunderbird. The new one works fine. When I send an email to the old gmail account it bounces back saying "address not found. Your message wasn't delivered to ------@mchsi.com because the address could not be found or is unable to receive mail. 550 5.1.1 I had the tech that sold me the PC look at the settings on Thunderbird for the gmail account and he said they were okay. Where else can he check? Somehow the pc thinks that just that one gmail account is run through or attached to mchsi.com Kathy foggiak@gmail.com

Using Thunderbird 140.3.0esr flatpak

Following the [chat faq], I tried to log in with my matrix mozilla.org account following the page instructions. For my @username:mozilla.org account added username in the Username field, mozilla.org in the Server field, then followed the rest of the steps (not entering the password because I'm using mozilla's SSO account, etc).

After finishing the set up wizard, it pops up the mozilla.org page (image below) saying there is an error and there is no further progress is possible. Any suggestions are welcome

I've come over from Postbox as that app is no longer being supported. In Postbox there was one file (panacea.dat) that controlled how many old locations you would see in the Move To menu. Once the number of items got to be a bit too muchj, I would delete that file and it would clear the Move To menu item. Is there such a file in Thunderbird that controls the Move To menu, or can it somehow be controlled by a setting in Thunderbird? Thank you.

On my PC Thunderbirds sending/receiving mail says the mail server refused my connection. My laptop works fine. I have duplicated my laptops in/out specifications onto the PC but still nothing works. Spectrum says everything on their end is fine but can't vouch for roadrunner who is the rr in my mail address of ca.rr.com. All this started about 4 days ago. Any ideas on what to try next? Thanks.

Hello:

I use Thunderbird for work. I have several email accounts configured in it, including Gmail, my company's email, and Outlook. I recently added a new Outlook account, and I haven't been able to send a single message. The error I'm receiving is the one described in the title. It's worth noting that I have another Outlook account working perfectly. I've tried every solution I've found online, and none of them have worked, including enabling SMTP in the account settings, making sure OAUTH is enabled, using smtp.outlook.com or smtp.office365.com instead of smtp.mail.outlook.com, enabling two-factor authentication, changing my password multiple times, etc.

Hi there! I and my colleague encounter some bugs with Thunderbird and we would like to seek your advice in regards of the issue.

1. <user a@citizen-systems.com.hk> was supposed to get a cc copy of the email sent by <user b@citizen-systems.com.hk> at Mon, 12 Jan 2026 09:35:19 +0800 but it never reached. The receivers, namely <user c@systems.citizen.co.jp> and <user d@citizen-systems.com.hk>, however, were able to get the mail. <user d@citizen-systems.com.hk> and <user a@citizen-systems.com.hk> are working at the same office and under the same network. Network provider checked the protocol, router, traffic and firewall are working as normal.

2. <user e@citizen-systems.com.hk> found a number of emails that she kept at "Inbox" disappeared on 12 Jan 2026 morning +0800.

She is unable to find it anywhere at her whole mailbox but has to ask the senders to resend them to her.

It would be very much appreciated if you can check and advise how to prevent the issue from happening again.

(PII redacted by moderator)

good day....ii hope someone can help. the other day i was accessing my yahoo account spam folder and by accident, i deleted the spam folder instead of emptying it. the spam folder is now sitting in the trash and i'm unable to remove it from there. when i log into my actual yahoo account, the spam folder is where it's supposed to be and not in the trash. i tried removing the yahoo account from thunderbird and reinstalling it in hopes that it would rectify the problem, but it hasn't. does anyone have a solution?? i would greatly appreciate any help you can offer. thank you for your time...mike s

My question / subject tells most of the problem. Here it is again in slightly more detail: SPF fail is the part of the undeliverable response to two different emails sent yesterday. What to do? Is down to me or ISP? Is this a Thunderbird problem, or a server level issue? If it is Thunderbird, what action do you suggest?

Hi, I have recently had a problem with one of our cats walking on my keyboard. Previously the Thunderbird page had two panels, the top one listing emails in date order and the bottom one displaying the message I had highlighted on the top panel. Now I have the top panel which is fine but I can't get the bottom panel. Can you help please? Douglas.

Have asked this question before and last time it finally work, now nothing works

Have tried so many times to transfer from old laptop to new laptop, nothing works. Have watch the youtube videos and followed this. Can not get it to work.

and what does this mean three levels up to the AppData\Roaming folder

Just want the emails from the old to the new laptop Thank you

I spent hours today with Rogers/Shaw support with nothing but a waste of my time. At the end they blame Tbird and were totally useless in helping. Thunderbird was fully working two days ago and I made no changes to anything. I am using the latest Tbird version. Today I uninstalled it and reinstalled with no change. I hate Rogers/Shaw but want to keep my email ID that I have used for many years.

I suspect this is password issue caused by Rogers but I can't identify it and as I said ROgers support was a waste of time. On the support chat the previous day they said they had a "back end" issue but now say that was fixed.

I'm on latest T-bird 140.7.0-ESR 64-bit. I have random failures when trying to move individual files or folders from LOCAL FOLDERS back to MAIN emails. Moves some, sometimes, then won't move, or will move some but not all, and often corrupts the files back into Main folder. I only use one email under T-Bird. This has happened for years, but I have been judicious about moving files and lived with it. But it's still a problem that I would have thought something like this would have been fixed long ago? .The formatting of LOCAL FOLDERS & FILES in LOCAL FOLDERS seems different & convoluted vs. a straightforward formatting in MAIN where I can easily move withing Microsoft file management. But trying to reconfigure and COPY or MOVE Files or Folders from LOCAL is very problematic.

Hi! I am trying to use the Thunderbird application to help me view a huge '.mbox' file from an email account that is no longer active. I have the entire file saved to my computer as I downloaded it before the account was closed. Can you help me access those files? I am working on a huge project and really need to look for date sand times of emails sent in the mailbox so that i can piece together the timeline of the project. I would greatly appreciate this!!!