Thunderbird Community Forum

If there's one thing I can count on, it's that the next version of Thunderbird will be more buggy & unstable that the previous version, and v 140 certainly does not disappoint in that category. It crashes & closes multiple times per day. Any time something else may be using a lot of resources, Thunderbird freezes up and if I click on it, the app crashes & closes. At least the previous just stayed greyed out until it was able to complete the task and didn't crash & close. Great job Mozilla.

Someone tried to help but I don't seem to be able to reply to that person . It seems that my new computer put Thunderbird on an STMP server and my phone and my old computer are on a POP server . i would like to have them all on the same server so that when read or delete they show read or are deleted on all my computers .

    Thanks ! Ken

I have been testing the new EWS support for thunderbird using version 144.0.1. My account needs the option `experimental.mail.ews.overrideOAuth.enabled` set to `true` to specify specific OAuth2 values (Application ID, Tenant ID,...). I see that receiving emails is OK (although the OAUth2 login page is popped up all the time and immediately hidden again, for every email I select, but maybe I have something weird because this is just a test).

But I cannot send emails using that account. My feeling is the advanced overrideOAuth configuration is not used for the sending/outgoing server. Just for the incoming server part. Am I alright? Is there anyway of setting this overrideOAuth values for the outgoing sending server?

I have tested the same with evolution and I can receive and send emails. So I'm pretty sure that the outgoing part can work when using the correct overridden OAuth2 values.

Hello, gentlements!

I have installed Thunderbird via POP3 protocol. I can receive mail, but not send. Yesterday I bought BitDefender Premium Security with VPN (Unlimited traffic). As soon as I turned it on, I can't send any more messages. When I turn it off, I can send messages normally. My VPN is set to my country (Croatia). Can someone help me how to get Thunderbird to work as before? I would like to point out that I really need a VPN, because I work with sensitive data. Here are the settings for the incoming and outgoing servers:

Wir haben vier Email-Adressen bei Thunderbird. Bei drei davon wird in der Kartenansicht bei Beteiligte der Absender angezeigt. Beim vierten Postfach wird immer der Empfänger angezeigt. Wie kann man das ändern?

Hi there I have a problem that has become more serious of late. I am asking because I mostly use Thunderbird, but it is not limited to it. Please patiently read to understand the problem ...

I regularly use 4 Wifi networks, 3 of them, I will name A, B & C connected to 3 different local universities and one the home network. There is no problem sending mail in 100% of cases, at home & networks A & B. I noted though at network C, where I am mostly on Sunday's, when I send mail, basically with Thunderbird from one of my Gmail accounts to a particular friend's Yahoo email, that the email bounced with some errors I did not bother to read. Since it'd happen repeatedly for months, I just sent them later from any of the other 3 networks. I thought may be it has something to do with that particular university's network security settings. The emails are just text messages, now & then with photos.

Then last Saturday, after emails while in network C were repeatedly rejected, I remembered, whenever I log in to my webhost's website to work on my site, that it does not connect with some error. Also a Filezilla FTP client does not work, but in both cases, when I use a VPN client, both work. I tried VPN, and sent an email to this friend & it was also rejected. Same when I tried using a browser. Sending emails to other people, I have never noticed any problem,, just this particular Yahoo email. I need to say during the several trials, 1 managed to slip through, though I had forgotten to paste some text & so tried sending again. Same issues, when I used a different Gmail address.

That evening, I also tried send the message from the home network & to my horror, it was rejected. That had never happened before outside university network C.

The following day, I decided, while using Network C to try sending that same message from an Outlook email address to that Yahoo email & CCed emails of mine, Gmail & AOL & Yahoo. None arrived. As said, the problem seems to involve this Yahoo email of a friend, because all other emails go with no issue. Up to last weekend the issue was only when I was at network C, but now at home + university network A. Not been at B of late.

This is part of the error message:

Message blocked: Your message to friendsmail@yahoo.com has been blocked. See technical details below for more information.

The response from the remote server was: 554 Message not allowed - [PH01] Email not accepted for policy reasons. Please visit https://senders.yahooinc.com/error-codes I read somewhere 554 error messages are permanently blocked or something like that.

The question is what is causing this and how can it be solved? I tried giving a detailed explanation in the NEW Microsoft forum website "learn.microsoft ...", but I discovered later the post was deleted for supposedly violating community guidelines. I posted on the former "answers.microsoft. ..." for over 10 years and there was never an issue, so that was annoying, especially not knowing what in my explanation broke their rules. Also search results for possible answers mostly involved issues with the MS Mail client, which is NOT my problem as you can see.

Since I mostly use Thunderbird, I though someone could help me find the cause and solution. I need to add, that friend with the Yahoo email address, has no similar issues and only hears about blocked messages from ME, previous, ONLY when sent from Network C. It is not that his email is blacklisted by Yahoo or he'd be getting no traffic at all from all other sources. I get dozens of emails a week and have NO known issues, of any blacklisted by anyone.

Before posting this, I decided to copy the exact message I sent to the friend, with an attached photo to these accounts of mine from a Gmail account on Thunderbird: Yahoo, a different Gmail, Outlook & AOL. Yahoo & AOL rejected the message, with identical error message:

Mail Delivery Subsystem <mailer-daemon@googlemail.com> 12:11

• • Message blocked ** Your message to myemail@aol.com has been blocked. See technical details below for more information. Learn more here: https://senders.yahooinc.com/error-codes (Warning: This link will take you to a third-party site) The response from the remote server was: 554 Message not …

Thank you in advance

How to Change the Maximum Length of a Folder Path Name? The Thunderbird client does not see folders due to the path length, although they are displayed on the mail server.

Suddenly I am not receiving emails from my church and financial advisors (especially daily and weekly newsletters). They are NOT going into spam; I'm stumped. Appreciate your help.

I cannot sign into thunderbird. A window pops up saying incorrect password, enter new password. This message keeps repeating no matter what password I try. Is there a phone number I can call to talk to someone?

Just updated to latest Thunderbird version and now I can't send my email. I keep getting the message "Login to server smtp.broadband.rogers.com with username [my email address] failed."

Then when I exit this notification, the following shows up "Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) . Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'."

I made not changes afer in upgrade of Thunderbird to latest version.

Any help you provide would be appreciated.

Bob Gmeindl bob.gmeindl@gmail.com (btw, this is not the email address I use with Thunderbird - that one is bgmeindl@rogers.com)

I have noticed that quite a few emails have gotten into the junk folder despite the fact that they meet the criteria to be filtered by my own custom message filters and I have those filters set to run before junk classification. So it seems the junk filter is actually being applied prior to my own message filters. I'd really like to just turn off the junk filter entirely because I like to make my own filters to catch things that I deem as junk, (and that is how it worked on my old version of thunderbird that I had on my old laptop). Is it possible to turn it off, and if so, how?

If it is not possible, then it would be good if this apparent bug were fixed.

I included a screenshot showing just one example of an email from an address I had created a custom filter for in the junk mail folder.

Good day, After upgrading Thunderbird to 143.0.1, I noticed that a large part of one of my local folders is missing. Searching the internet regarding this problem, I found that this issue happened last year and at other occasions. Why hasn't this problem been solved yet at it is a pain to locate and find the missing data ourself. Any suggestions to avoid this problem in the future

Best regards Douglas Noades

Had this problem suddenly crop up since the update of one of my accounts not sending mail due to timeouts. I've not changed any passwords or settings since I had it working last. The message is the "Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) [my workplace's SMTP server] timed out. Try again." one, and it's preventing me from sending any emails.

Specifics:

• It's one account (my work one: work runs an Outlook/Microsoft mail server).
• My personal account (gmail) sends fine. Both accounts recieve email fine too, so this is just one direction on one account.

Things I've tried:

• Switching my Firewall off makes no difference, so it's not a firewall problem
• It's not that the emails I'm trying to send are too large, one word test emails also don't send
• Extending the timeout time by 3x doesn't help

I also opened a second computer not yet running the latest version - the account worked fine. Then applied the upgrade and that broke things in exactly the same way as described above. So I'm pretty sure this is an issue caused by the upgrade in some way. Not sure if other people with Outlook servers are having the same problem or if there's any workaround available but would appreciate advice.

Using TB 141.0 MS Word 11 Too many wrong videos, too many old explanations. It's August 2025. Please, I'm not a computer wiz. Just a home novice. OK with specific directions. How to export my Gmail contacts list and import it to my TB contacts. I have tried basic gmail export...but should it be "google .csv", " or what? I don't think I have Outlook loaded anymore on windows 11. If you could help by actually sending me instructions that I will follow direct. ie: Sign into Gmail>click on contact file to be exported>export contacts and click "google .csv" (or the correct choice there)..then what? I've been trying and it wants me to save to a file...but how? And which file? I know it's an effort on your part, but I will print and save going forward. Thanks so much. LS in AZ.

Most of the questions I have are either not answered at all or not answered in help or in forums and I'm unaware of any responses to questions I've asked. Isn't there any way to get support from a live person? My questions are often quite complicated. When I ask a question, I get dozens of answers that have nothing at all to do with my question and I don't have time to look thru all the answers. When I do see an answer that might be relevant, it either isn't or the answer is far too technical.

For example, I have no sent folder. Cant understand answers that tell how to create one. Need to be able to save my sent messages. Having to cc myself to get a copy of a sent message - stupid situation.

I am switching from Outlook to Thunderbird because of complicated problem with Outlook. Got garbage when imported csv contact file and can't find how to delete a large number of contacts. Reluctant to use your specific Outlook import in case it brings the Outlook problems along.

Really need help with lots of things making the transition. 'bold text'