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I am using thunderbird client on arch linux. I am trying to filter by adding "Reply-To" as a filter. If i look into the source of the email i am trying to filter (i get like 100s of spam messages and only the Reply To seems to be from the same domain in the end) the Reply-To appears in there.

Any idea how to fix that? The other rules work fine, this one only seems to not work

My business has two domains. I can send email to a Gmail account holder using the primary domain with no issues. But amy emails from what I call the "secondary" domain below are treated as spam. This occurs with two different email addresses using the secondary domain.

Both domains are hosted with Bluehost. Exhaustive research has revealed the following:

• Settings in Thunderbird are exactly the same, e.g. ports, security, SSL/TLS, etc. for each domain.
• There is no subject line or content that could possibly be regarded as spam.
• MXToolbox indicates that the secondary domain is not on any blacklist.
• Extended support via Bluehost reveals that SPF, DKIM, and DMARC records are all correct.
• Email sent to a Gmail account using the CPanel (Roundcube) is not flagged as spam. Only emails sent via Thunderbird are flagged.
• Emails sent to a Gmail account from the secondary domain using my mobile phone, but still on the same network/IP address, are not flagged as spam.
• If I first send an email to one of the secondary domain emails FROM Gmail, then reply to it, the reply is not flagged as spam.

After many hours of head scratching (and later, head banging), I am pretty much at my wit's end with this problem. I'm an electronic engineer but this one is definitely out of my wheelhouse. Any help would most certainly be appreciated!

Thanks in advance, Don

Hello, In our WordPress website, we have a page dedicated to our contact form. I have it connected to the email I have in Thunderbird so I can receive the forms; however, I keep getting the error of:

Mailer: Other SMTP SMTP Error: data not accepted. SMTP server error: DATA END command failed. Detail: Your message has been rejected because you have been detected sending high likelihood spam.

I saw online that I have to contact Thunderbird to resolve this issue since they are the SMTP provider. Please let me know what I should do.

(Note: I am not a coder so if I need to do any coding, please specify where I have to go and what to click)

Thank you

This post is to inform others that release 153.1.0esr finally fixed this previously unresolved issue with spam filters in unified folder mode for me. Up to 140.14.0esr the problem persisted.

I cannot see any other relevant variables in my setup that would have changed concurrently so I am assuming a now fixed underlying software bug as the cause.

Some good E-mails got moved into junk, so I right-clicked them and marked them as "not junk." Seconds later, they reappeared in the Junk folder.

Also, Thunderbird continues to classify messages from the same sender and even the same thread as junk. I read the doc here: https://support.mozilla.org/en-US/kb/thunderbird-and-junk-spam-messages#w_tell-thunderbird-what-is-not-junk

and the behavior is not consistent with what's described, or what anyone would expect.

Is this a known bug?

Thanks!

After first pressing "Mark" (K), the shortcut keys for "Mark as Junk" (S) and "Star" (S) are the same. Previously, the shortcut key for "Mark as Junk" was (J). Please make the necessary corrections.

最初に「マークを付ける」（K)を押してから、「迷惑マークを付ける」（S）と「スターを付ける」（S)のショートカットキーが同じです。 以前は迷惑マークのショートカットキーは（J)でした。

修正願います。

Some time ago I went tinto exceptions and put in some unwanted email addys and they were blocked. I am getting unwanted emails tried the same thing, but they are still coming through. Here are some of the emails; contact@news.comoundeesgtream.com contact@news.musteraliteinfo.com

Can you tell me how to block these from showing up in my email account? John @ redacted@outlook.com

Hello Thunderbird Support, I am experiencing a severe IMAP folder synchronization loop with my Yahoo Mail account ([redacted]@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.

Using version 154.0, all of my incming emails are going into my spam folder and my inbox is completely empty. I have turned off the spam assassin filter and the adaptive spam filter, but the problem persists. If I move a message from the spam folder to the inbox, it goes back to the spam folder within 3 seconds. I know that this is a Thunderbird issue because I uninstalled it and used my browser to access my email from my provider (runbox.com) and my inbox functioned correctly then. After I reinstalled Thunderbird, it somehow retained all of my settings and the problem persists. Is there a way to fix this?

So my question for the community is : why did this happen all of a sudden today and Why can't I delete or remove it?

Tried re-starting the app. Did a pc re-boot.

I always train the junk filter by marking mails that are erroneously sent to the spam folder as "Not Junk". They are transferred back to the Inbox as one would expect, but after a few minutes some (not all, but most) are again moved from the Inbox to the Spam folder. This happens repeatedly every time I mark these legitimate mails from addresses that should not arouse suspicion anyway, such as theguardian.com (an address that is in my address book, so should be whitelisted anyway) or Arri.com, just to name two current examples. Why is Thunderbird overriding my "Not Junk" flag? How can I train the junk filter if Thunderbird ignores this? Is there something in the Settings I'm missing?

I'm getting Spam Emails from about 10 regular Spam Accounts and I wish to Universally Block them by adding Them to my Filtering Lists. I'm using the * Character as a Universal Place Holder for the *@*.com, *@blah.blah.ca or com. The Filter works one Time then stops working for any fresh Spam. In other words, the Filter doesn't Filter any new Spam from these Addresses. Why?

OPERATING SYSTEM Windows 10 Professional (x64) Version 22H2 (build 19045.6466) System Model : HP HP ProDesk 600 G3 DM SYSTEM MODEL HP HP ProDesk 600 G3 DM Enclosure Type: Mini PC PROCESSOR 2.80 gigahertz Intel Core i7-6700T 256 kilobyte primary memory cache 1 megabyte secondary memory cache 8 megabyte tertiary memory cache 64-bit ready MEMORY 15.88 Gigabytes Usable Installed Memory BOARD HP 829E KBC Version 06.29 STORAGE 4.51 Terabytes Usable Local Storage Capacity 3.59 Terabytes Local Storage Free Space

• Waterfox - 6.6.12 (64-bit) • Thunderbird - 140.13.0esr (64-bit)

========================================

A few days ago the left (file) pane went from

- InBox
- Drafts
- Sent
- Junk
- Spam
- Trash

to

- InBox
- Drafts
- Sent
- Spam
- Spam
- Trash

I attempted to change the first "Spam" back to the original "Junk"; didn't work. Have no clue why TBird decided to change the file names on its own.

Any information/direction(s) about how to correct this back to the original?

Thank you / appreciated. Nels

I use to be able to mark email as junk by right click then K then J. The junk option is not there any more but spam is. The problem is both add star and as spam are both S, so K - S does not work. Need to change one of them to a different letter.

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.