Thunderbird Community Forum

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.

Hi Team, I right click on a message header and select "mark as spam" which then deletes it but it will let another message from the same place in at a later date, is there a way to have the messages I mark as spam go straight to the spam folder?

Thanks, regards Steve

I am new to Thunderbird, and attempting to use it as my email client. So far I have imported my main Gmail account, a second Gmail account, as well as three different Microsoft accounts. There is a duplicate Spam folder on one of the Exchange accounts, which I assume came with the import. There is, however, no way to delete the Spam folder from the original MS account. None of the other accounts has this issue, although when I had duplicate Trash folders on Gmail accounts earlier, I was able to delete them from the original account, which allowed them to disappear from TB. The Spam messages in TB actually only populate into one of the Spam folders. Any ideas what else I can do to get rid of this superfluous Spam folder, please? Many thx for any help!

A category (Daily Brain something) of emails that are clearly spam (you even think they are spam) are landing in my Inbox every day. I have my email set to not allow emails from any addresses that aren't in my book. If I follow their 'unsubscribe' link, I just get more of them. This is the latest one: ar849137@ocotille.com with a Reply To address of: 3527_rep_Y2pnZGVzaWduc0BlYXJ0aGxpbmsubmV0@ocotille.com Every one is different. Why are these getting through? Thanks Cary

I get your begging for money, you are obviously young, I have donated more money to you already than all my other email providers combined, period, you will allow me to move , remove as much as I want or I can delete you and you lose any future donations, but ticking me off with this we think this is junk crap trying to get more money from me only makes me want to DELETE YOU YOUNG PEOPLE, you act just like your buddy Google, lmk Anthony, or stop the bs

Please inform me how I can mark senders in Thunderbird as not spam or is there a list of secure senders so their mails will not go to spam folder?

Best regards Magnus Arnason

I want to create a filter to match any of the 20 addresses on my list. Rather than manually repeating the 'add rule' 19 times, I hoped to import all 20 at once.

Creating a filter with 'to' and putting a comma separated list there doesn't seem to work; the addresses won't be matched. I can't find a config file to manually edit in my profile directory for filters, or an extension to create this filter.

My end-goal is to add this 'blacklist' of my old e-mail addresses that have been leaked to a spam filter. These messages already end up in my spam folder by a rule at my provider, but I want to mark them as spam too, so I can sort through the spam folder more easily to find false positives.

Thanks in advance!

There are certain emails that I receive that are *absolutely known* spam. I want these (but ONLY these) deleted as they come in.

I understand that one need to tick the "delete" box in Settings, but this seems to giver Thunderbird the right to delete anything that 𝒊𝒕 determines is spam. I don't want that. I want ONLY my own predetermined spam to be deleted.

And by deleted, I mean just that. Thunderbird just piles them up in the Trash folder, and this gets to be a big pile. Because Thunderbird makes mistakes, cannot just let it delete everything it determines to be spam, and so I have to go through this long list of junk in the Trash folder, which is annoying (because there's surely a better way that no one has implemented yet) and time-consuming.

I've made my own "delete" filter. It runs first (it's the first filter in the list), "before Junk Classification" and "Getting New Mail". Anything on this list should be deleted, because that's the ONLY action I have in this filter. If you're in here, you're gone.

Except your not. The filter is (for some reason) NOT run when new mail arrives. Instead, I have to open the filter, and choose "run on Trash folder". Then it works. But is THAT the design?!? Why is it not deleting arriving mail that meets the criteria?

There is also the problem now (as spammers have gotten more proficient) of the random character string preceding the @, followed by a domain name that you dare not mark as spam (for example, yahoo.com). These random characters are indeed random, and constantly changing, so you cannot filter on the address. But it seems to me some bright person might come up with something like "if 'known domain' is NOT preceded by 'known sender', delete". (This would require a user [me] to be very careful, or I could lose a new respondent who is not spamming me.)

But the point here is this: Over time, I have a great "delete" filter. Mail that this filter catches makes NO mistake. I want these messages (but ONLY these messages) to be gone when mail is retrieved. I don't want them in the Trash. And I don't want to have to take the time to run that filter on the Trash, because no one has created an extension that allows me to do this with a single click.

I would pay/donate, for this capability. But I can't bring myself to donate, or pay, when I have to go through a big Trash pile full of mail that, according to my filter, I should NEVER even see.

Other suggestions entertained of course.

But I'm spending too much of my life dealing with things that should be automated.

Regards,

Recently started getting many more mails than usual. many if not all related to setting up an account at a site from which I had not solicited an account. some included requests to acknowledge charges to my account for purchases I had not made charged to payment accounts I did not have. Some I could not read because they were in languages I did not read. My usual practice is to read and then delete emails that I don't need, but the ones I am receiving are so numerous, reading each and then deleting is impractical. I need some way to delete by categories. I don't understand what is causing the flood of emails but I need to stop it if I can. Hidden in the emails I am getting may be some I need and if I delete by categories I may lose some that I need, but at the same time, it is impractical to read and then delete individual messages. mails Anyone have any idea what caused the flood of what appears to be spurious emails, is it some sort of scam or cyber attack?

I used to be able to copy links from Youtube and send them to people to watch. Now thunderbird is not letting me do that and says it is spam. This is so irritating as my bedridden sister loved to watch the things I would send her. Is there a way around the spam setting?

Just recently, some of the emails I receive are full of messages in red next to almost every line of the email saying that things like "Likely fraud detected" or "Do not trust this website." There is no indication as to what program is creating all these warnings. I have tried to turn off anything I can find in Thunderbird's security settings to no avail. The main source of emails with these warnings is "Beermenus.com" which I have been receiving for quite awhile before this started. Any ideas on what to do

Hello, I get oftem spam mails with a header like the following: from:Singles50 subject:Momenti speciali insieme per gli over 50 Reply-To:reply_to@miracel001.entrydns.org>

I tried to create a filter adding as personalized condition "Reply-to" that Thunderbird saves in the msgFilterRules.dat as: condition="OR (\"reply-to\",contains,@miracel001.entrydns.org)"

There is no way to get any filter working, do you have a suggestion on how to fix this issue ?

Thanks

I recently upgraded to TB 128.14 Oesr (64, Win 10). I’m a bit conservative about upgrading anything – as upgrades often waste a lot of time – if not risk justified.

Basically, If it’s workin’ well enough (cost vs benefit) …… well … “don’t fix it” – even though … “if it ain’t broke, doesn’t mean it isn’t sub-optimal”. Here, it seemed worth the risk.

My prior TB version – nope, I don’t remember which it was (is that in a log?) incorrectly identified bookoo normal e-messages as “junk” (junk filter deactivated) wasting a LOT of my time to move them back to the “indox”.

It also – CORRECTLY ID’ed – a big lot of data sucking spam as “junk” (junk filter still deactivated) for my PUBLIC e-address (expected spam magnet) – alerting me of the quantity of (expected) spam I was actually getting (my free Omaha steaks are on the way).

After upgrading (to TB 128.14) I don’t get any, well much of that spam any more (got a couple today) – hurrah (maybe)!! I don’t see it any more. It is gone completely (mostly, ostensibly) and the problem is – I do want to SEE it – all of it – in a “spam folder / directory” nd not in trash– wherever it is – to make sure it is NOT mis-ID’ed as spam – when actually an important message maybe telling me I’ve won the FIFA email prize!

So … “the game is a’foot! Holmes! How can I track down that missing spam – to see ALL of it – to verify it’s identity?

I suspect my hosting company – Hostinger – may be involved – as I did verify, previously, with my previous TB version – that they COULD see into my TB account structure. Can’t find it now, but previous did see MY TB account named “Aviation”. They, Hostinger, said THEY aren’t “moving” anything anywhere – not into “Junk”, anyway. Are they lying (as popular as that has become recently)?

I’m not smart enough to understand DKIM (though I could get that way) just want to see ALL email sent to ALL my e-addresses that didn’t get there – wherever it is (not immediately, I would hope)!

Merci,

Dru