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Starting in mid November 2025, my subfolder - named Apps, disappeared from my folder structure. I've used this for many years without an incident. It remains on my structure when I open my email via a web browser, but is absent from Thunderbird.

What changed? Is there something now forbidden about the name?

As I have message filters created to sort all my emails, it is a real problem now with Thunderbird. I would be grateful if someone can enlighten me on how to solve this issue. Jerry

I have 21 filters set up in Thunderbird (originally on the Mac, now on Windows). This is for an IMAP account.

Most of the filters are simple, one match, mark message as read, move to a folder. A few have multiple matches, but the same mark read and move to folder steps.

Some filters work fine, some do not work at all. The ones that are not working are the simple single match ones. There's nothing in the filter log showing what the issue might be. The filter in question doesn't show up.

What can I do to track down what the issue might be?

Thanks.

Hi I completed a search of a folder and saved the results to a separate Search folder. After I "investigated" the listed messages, I wished to delete the "Search" folder. I was suspicious so compared the list in the Search folder with the Original. Found that the messages in the Search folder were now missing from the Original folder. So went back to Search folder and copied each message to the Original folder. As a check, I then recorded the details of six messages in the Original folder and deleted them from the Search folder. I found they were also deleted from the Original folder. Bummer! Edit\Undo Delete. Didn't work. Have apparently now lost the record of those six messages. Two questions: 1 Can those six messages be recovered? 2 Can the Search folder and the copies of the messages in it be deleted without loosing them from the Original folder? Thank you Graham

My inbox has more than 46.000 mails, maybe this is too much. Still, cannot move some mails to my archive. So I need urgently help! My mail is [edited from public support forum] @gmx.net I am willing to call somebody. I am alxo willing to contribute some amount. best regards Gottfried Scheiwein

Sent mail has suddenly vanished, even though it is still on the originating file server. This happened very suddenly. I uninstalled and reinstalled Thunderbird, but no change. I am about to reboot PC to see if this will solve the problem. Very strange!

I use Thunderbird as my email client for my HP Laptop,for a number of email addresses. Working well. Curiously after an update to my to my password in my Telstra BigPond Australia email address- [edited] @bigpond.com & coincidently within a day of the December 10, 2025 Thunderbird update- All my emails disappeared. OTHER emails remained untouched. My email account address line appears. The Inbox, Sent, Deleted labels appear, but empty. Please help. Could it be a 'profile" issue. The server settings appear correct when using Google mail on my phone. My email [edited[ @bigpond works on my Android A55 mobile. Your assistance would be greatly appreciated. Kind regards A backup email address is itrainielts.com. Pranas Kriauza phone [edited phone# and address details from public support forum]

Hello,

I have two accounts on Thunderbird, a yahoo account and a gmail account. the yahoo account shows a sent folder but the gmail does not.

I have tried to read through the forums and one answer was to right click on the gmail account name to subscribe but I do not have that option show up.

Thank you

I have three accounts set up in Thunderbird and my "ALL MAIL" folder has disappeared from my GMAIL ACCOUNTS. I did however appear to have 2 x Archive folders but in schofijnet10 one has disappeared in john.schofield10 i have 2 x DRAFT Folders and 2 x Sent folders in schofijnetQaol I have 2 x ARCHIVE and 2 x SPAM Folders Please see the image

Starting 2026 Comcast is moving all email over to Yahoo email. We will be able to keep our Comcast email address, but as of this writing I do not know what suffix Yahoo will add to my 2 accounts. Both of my Comcast suffixes are Comcast.net and that is how my email comes through now. I was shared a linked that I didn't from Comcast about the pending change. Will the suffix change from Comcast.net? I have attached the link that was shared with me.

I guess with your Comcast e-mail, you need to know this. Comcast e-mail is going away and users are being switched over to Yahoo e-mail sometime in 2026.

Upgrade your Comcast.net email experience to Yahoo Mail

https://www.xfinity.com/support/articles/yahoo-email-migration-overview

My computer crashed and so restarted it, when went to open thunderbird got a couldn't load XPCom message. Followed directions to reinstall thunderbird without using the uninstaller. When I installed it, I reloaded my email to set it up. I have lost all my latest emails, only getting them from 15 years ago. and today, nothing from this year. All my folders have also gone and my contacts.

Can someone please help, how do I fix it, I have emails from this year that I need to keep.

Thunderbird 140.6.0esr (64-bit) "On Linux LMDE 6" 64 bit, on an Intel platform. An HP small format desktop, using two screens.

I see this issue (below) when receiving digest mail from groups.io See the hopefully attached image. If that didnt come through, I can send you a whole screenshot if needed.

The issue is that the first line is correct. The "sender" is the group "linuxham" and is a mail digest message. The second line "Thunderbird 2025: A Year in Review" is correct.

However.. The third line from the UKMicrowaves group, another groups.io group configured to use "Digest Delivery" mode, is shown as coming from "[edited] @groups.io" Misleading at best! (It is always the linuxham group details that is used, regardless of which group has sent the digest.)

The last two lines are correct.

I see this on all groups.io group mail where what comes to me is in the form of a "Digest" (so as not to flood my inbox.) Does T'Bird handle "Digest" mails differently to one-to-one mails?

This odd labeling of the "Correspondents" started some time ago as a result of a past T'Bird update, but prior to that update, was not an issue. I have "Many" groups.io groups I'm a member of.

Sorry but it's taken me this long to find out how to submit this info and ask the question.

I'd love for this to be fixed, and am willing to test any trial version(s) that may be needed, and/or to provide any other needed system info that would help. I am contactable on [edited from public] @googlemail.com

Oh... I made "Many" attempts over the last year or three to setup a "Mozilla" account to report this, but I now know "Mozilla" has renamed to just "Moz". Sadly, "Moz account creds" are not accepted! to login here.

By accident I found that a Google ID works. Pity that was not sorted some time ago, else I could have reported this sooner. (Better presentation on the T'bird support initial web page would help with such confusion, or is this intentional to filter out lame questions? And lower support costs! I know of others who implement such! ;-)

Anyway, thanks for seemingly letting me in at last. Much appreciated from a long time Thunderbird user of "Many years".

Even with the above wrinkle, it's far the best mail client out there I find. True "Cross Platform" too. (Though I found the Android offering rather "clunky" at best.)

Thanks Again.

Yours...

Dave or G8KBV, yes a "Ham"...

How do you look down through your emails and select multiples to delete? the answers I've found involve highlighting and deleting a bunch in a row. What about when there are a couple of keepers in the mix?

The tree I made for LOCAL/SUBFOLDERS...is now IN A CRAZY .mst unreadable computer language. I need all the files contained in this tree to go back to readable. Gerry