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Since yesterday (27 Apr 2026) any and all mail that comes into Thunderbird gets marked as SPAM. I searched online and found people saying that I could reset the junk training filter, so I did this, but incoming mail was still marked as spam. The next suggestion was to delete the training.dat file. Did that, restarted Thunderbird and incoming messages are still marked as spam. The last suggestion was to turn off adaptive junk mail controls. Didn't want to do that because I assumed that it would let spam through. Nope. Turned it off, restarted Thunderbird and two emails from my work came in and got flagged.

I'm running version 140.10.0esr (64-bit) on Windows 11. I am using IMAP to connect to the mail server but it's not running any spam detection software (like Spamassassin). I know this because it's my server and even if it was, no updates have been preformed since the first of this month and this just started happening yesterday. Combine this with the bug that Thunderbird notifies me of incoming mail, even if it's spam (didn't post about this because there are plenty going back a couple of years), is starting to make me look for an alternative.

Android app is Missing Spam Folder. A Yahoo filter on the server moves important emails to the spam folder. The spam folder does not sync with my other folders. Yahoo places these messages inside the Thunderbird app but they cannot not be read, I cannot find the folder, I cannot sync the folder, and the app does not give any other option on the setting panel. On my phone I have to have both the Firebird and the Yahoo App to see all folders. How can I fix it_

Thank you.

I recently added a email address to my thunderbird email and it brought forward a lot of messages from Yahoo that are spam. I would like to block them and instructions I have were dated 2016 from Mozilla. Is there a new instruction on how to block?

There was an earlier Case with the exact same name as what I named this case which was archived back in 2025. I have been living with this same problem since last year also. In the previous case there was reference to "downgrading" to an earlier version of TB, but there have been a bunch of updates since then so I doubt that would fix my problem because that earlier version is now over a year old.

I have one Gmail folder that correctly has one folder label "Junk." However, I have 4 folders that are AT&T related (2 from the domain "sbcglobal.net" and 2 from the "att.net.") For some reason when I set these folders up years ago they started out as labeled "Spam" instead of "Junk." Of those 4 folders 2 of them have the duplicated "Spam" folders, one from each domain."

When I go to Folder Properties I see "imap://XXXXX%40sbcglobal.net@imap.mail.att.net/Junk" on one of these Spam folders and "imap://XXXXX%40sbcglobal.net@imap.mail.att.net/Bulk" in the other. And the same "Bulk" vs "Junk" issue is in the other domain as well. All are named "Spam."

Can I simply delete one of these folders that are named "Spam" in each domain? Does it matter whether I delete the one ending in "Junk" or the one ending in "Bulk?"

Thanks.

Hello Thunderbird Support, I am experiencing a severe IMAP folder synchronization loop with my Yahoo Mail account (paulpersonne519@yahoo.fr) inside Thunderbird. Yahoo Support claims the issue is caused by Thunderbird's folder mapping, so I am reaching out to you for a solution.

1. 1. The Problem:

The system-protected folder "Bulk" (Spam) has somehow been moved or mapped as a subfolder inside the "Trash" folder.

• In the Yahoo Mail Web UI (Chrome), the subfolder is invisible, but the Trash directory shows an arrow (^) indicating a child folder exists.
• In Thunderbird, the Bulk folder is clearly visible inside the Trash folder, marked with the flame (Junk) icon.

1. 1. What goes wrong:

When I delete spam messages via Thunderbird, they get trapped inside this nested Trash/Bulk directory. If I try to delete or empty it, the emails disappear but the folder itself cannot be removed.

1. 1. Steps tried so far that failed:

  1. Attempting to delete or rename the Bulk folder inside Trash gives the server error: [CANNOT] DELETE failed - Mailbox is reserved.
  2. Using Shift + Delete on the folder is rejected by the Yahoo server.
  3. Unsubscribing from the folder via "Advanced IMAP settings" -> "Show only subscribed folders" fails; Thunderbird re-downloads the structure on the next sync.
  4. I have completely deleted my old Thunderbird profile folder and created a brand new one using thunderbird.exe -P. Upon adding the Yahoo account via OAuth2, Thunderbird immediately pulled the same broken Trash/Bulk structure from the server again.

Since Yahoo refuses to help and claims Thunderbird caused this mapping loop, is there a hidden config setting (about:config) or a database override in Thunderbird that can force the server to release or move this reserved folder back to the root directory? Thank you for your assistance.

1) How do I get the emails Thunderbird marks as spam to be moved to the Spam folder without me doing anything. I have thousands of emails now most marked as spam but I have to go in and move them one by freaking one!

2) Also you freaking filter system doesn't work worth a crap! I have created filters for instance: for any emails that have @cypress.com in the From part of the message to be moved to a folder under my inbox named Cypress. I have run it many times and actually none of the filters I've created work? They are very simple to understand and I am doing them correctly as far as I can tell but they don't work. I have created at least a dozen filters and the only emails moved are ones I moved manually myself.

And this training crap you have I don't know what you think it should take a computer to learn to move something to a folder. It's not like a child that has to be taught how to spell. You tell it if it has this in whichever field you've selected then it should move it. Not have to be taught? Not a bright idea in my opinion. It's why AI isn't very smart at least what they release to general users. Anyway I digress.

If you can help me with the above issues in the above paragraphs 1 & 3 I would greatly appreciate it.

All e-mails from Pay pal go into trash. Have marked as Not Junk but this has not helped. Needed e-mail from Pay pal today to pick up a click & collect order but didn't receive any e-mail. Tried to log in to Pay pal on Android phone not desktop PC as I usually do. Kept sending codes to my e-mail address to log in but I received nothing. Wasn't until I had come home and accessed Thunderbird on my PC that I found them all in the Trash. Luckily store gave me my order and I didn't have to go back.

Despite my marking messages several times as NOT spam, Thunderbird keeps on and on RE-marking them as spam. And the mails are coming from one of my own addresses, and they ARE in my address book!!!!!

There seems no way that I can stop the beast from misbehaving.

I had this issue some while back, then an update resolved it. Seems another update has brought it back.

Having just updated, still on ESR, I find that I now have 2 folders named "Spam", but in fact looking at the folder properties 1 is actually still "Junk".

The images explain it well.

As in the past, I'm unable to correctly rename the second Spam folder back to Junk.

It has to be the update that caused it (as previously).

When can I expect another update to resolve it?

Bonjour, Pourquoi actuellement tous les messages que j'envoie avec ma messagerie Thunderbird depuis mon compte FREE sont-ils identifiés comme spams par mes destinataires GMAIL ?

Good morning.

A few days ago the "Junk" folders in my Thunderbird accounts, without any action on my part, were suddenly renamed as "Spam" folders.

Anyone know why this happened?

Thanks

Hi!

I am using Ubuntu 26.04 with Gnome 50.1 (kernel 7.0.0-28-generic). I installed Thunderbird 1:140.13.0+build1-0ubuntu0.24.04.1~mt1 amd64 from source (140.12.1esr).

When I receive an email, I get a system notification where I have an option to "Mark as read" or "Delete". For most emails, if I click on "Mark as read", the email will be marked as read. However, Thunderbird has the feature to automatically put emails into Junk. And if I click on "Mark as read" for emails that are going to be automatically put into Junk, the emails will remain unread. It would be nice to mark the junk emails as read when I click on the button.

Thanks in advance!

I keep getting messages from 2 sites that give me a virus. Hoardpot AND contact@musterateam.com When I tried to unsubscribe it didn't work.

Tell me what to do please. Thanks

Using version 21.0 on Android 15 on a Motorola Stylus 5G 2024 phone. For the last week or so, selecting "Empty Trash" for my ymail.com account results in nothing happening. I have to log into yahoo.com via my browser and manually delete emails in the "Trash" folder.

‘spam filters do not work. After 18 years of putting up with it I want block senders and sender ip's WHAT IS UP? WHY DON"T YOU FIX THIS - Do I have to go to M$oft?????’ for ‘Thunderbird’

In my Thunderbird client on my tablet (Android), phone (Android), and laptop (Windows 11) over the last week, it has stopped emptying the Trash folder by clicking "Empty". Also, across these platforms the Trash folder will no remain synced, while it appears other system folders remain synced.

As I have not made any client setting changes (prior to troubleshooting this issue), I must assume a recent background change/app update has occured.

Please advise.

Addressing the problem, Practice Better says my acct is not blocked on their end. They say put

notifications@practicebetter.io in a safe senders list, but I can't find anything like that. How could I get my Thunderbird email acct to accept Practice Better's messages?

Thanks, Jane Kroll

When messages arrive in inbox and are marked spam they do not auto move to spam folder. I have to uncheck the spam icon and re-check it. Not until then will they move to spam folder.

Martha