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Could anybody help me? Since yesterday morning I have not been able to send or receive emails on Thunderbird.

I have two computers: a laptop and a desktop. On both of them I use Thunderbird as my main email service. On the desktop I also have MS Outlook. I am able to send and receive emails on the desktop on MS Outlook.

Error message on the desktop when I try to send a test email: Sending message failed. The message could not be sent because the Outgoing server (SMTP) mail.rushmore.com failed. The server may be unavailable or refusing SMTP connection. Please verify that your Outgoing server (SMTP) settings are correct and try again.

Error message on the laptop when I try to send a test email: You are about to override how Thunderbird identifies this site. Legitimate banks, stores, and other public sites will not ask you to do this. Location: mail.rushmore.com:587 [get certificate] This site attempts to identify itself with invalid information. Outdated information The certificate is not currently valid. It may have been stolen or lost, and could be used by someone to impersonate this site. [check] [Permanently store exception]

    [Confirm Security Exception] [Cancel]

Interestingly, yesterday I was receiving the same error message on the desktop computer, except the number under Location mail.rushmore.com: was different (not 587). I do not remember what this number was.

My current SMTP server settings: Server name: mail.rushmore.com Port: 465 (Default: 465) Connection security: SSL/TLS Authentication method: Normal password User Name: halina@rushmore.com

Please let me know what I can do about this. Thank you!

Halina Hladysz

Please help me! I have expanded on the information which I sent few days ago.

1. Problem which needs to be solved: Starting on Saturday (Oct 18th) morning I have not been able to send or receive emails on Thunderbird. (I turn down my entire network for the night. On Friday evening, before I turned it down, I was still using Thunderbird without any problems. On Saturday morning, after turning the network up, Thunderbird did not work.)

I have two computers: a laptop and a desktop. On both of them I use Thunderbird for most of my emails. They have Windows 10 operating system. Thunderbird stopped working on both computers and at the same time.

2. MS Outlook still works On the desktop I also have MS Outlook. I am able to send and receive emails on the desktop on MS Outlook. There was no break in this software package working.

3. What happened in my email correspondence prior to this problem For about one week prior to Thunderbird’s stopping to work I received numerous emails – which appeared to be sent from my email address xxx@rushmore.com. These emails were pretending to be sent from various companies, including some warnings about my email which needs to be reconfigured or something like this. I deleted all these emails immediately without clicking on any links they would send. Unfortunately, my email provider (BluePeak company) did not catch these emails; they should had been sent to the SPAM folder on their server.

I suspect that maybe some of these emails, or one of these emails, created this problem. A virus?

I have done a full virus scan and it found no problem.

4. Error messages on the desktop when I try to send a test email:

See attachment number 1 for a screenshot.

When I click on [Cancel] I get this message:

See attachment number 2 for a screenshot.

Sometimes instead of these two error messages, I receive a completely different message: see attachment number 3.

5. Error messages on the laptop when I try to send a test email:

On my laptop the error messages are the same, except the number in the [Location] section is different. 587 on the laptop, 465 on the desktop.

6. My current SMTP server settings: Server name: mail.rushmore.com Port: 465 (Default: 465) Connection security: SSL/TLS Authentication method: Normal password User Name: halina@rushmore.com

Could one of you help me, please? I am completely “frozen” with being able to work on some of my projects; one important is organizing a big event and all my communication (high number of emails by now) are on Thunderbird.

Thank you!

Halina H.

Hi Thunderbird, At the weekend we accidentally completely deleted some Gmail emails from Apple Mail . These were also deleted from Thunderbird (2 Gmail accounts) on our PC. We recovered the emails, in the process having to change my Google Password. Whilst the deleted emails returned, one Thunderbird Gmail account was not receiving new incoming emails. (one account is) The emails are arriving as normal into Gmail. After various unsuccessful attempts to to connect to the server I deleted the defective Gmail account from Thunderbird, using the Red Button in account settings, hoping to then be able to reinstall it as a new account. When I attempt to reinstall the now "deleted" account I get the yellow "Unable to log in at Server" message. . The password I am using to add the account is the same as the one I use to sign into that account on Gmail (set on Monday), but it does not seem to be working on TB. I tried the trick of not putting in the password when setting up the new account but this did not work either. I am using TB 140.6.0esr Any suggestion please John

Bonjour, J'ai créé une nouvelle adresse gmail, qui fonctionne depuis le site de google. Quand je souhaite l'inscrire pour l'utiliser via Thunderbird (nouveau compte/adresse mail), tout se passe bien et j'obtiens le message "Configuration trouvée dans la base de données des FAI de Mozilla". Je clique ensuite sur Terminé et j'arrive à une fenêtre "se connecter avec Google" qui affiche ma nouvelle adresse mail. Quand je clique sur "suivant", j'obtiens le message "erreur 400 - le serveur ne peut pas traiter la requête, car son format est incorrect". Pouvez-vous m'aider ? Merci d'avance. Laurent Lapchin

Unable to send emails. A message appears saying the outgoing server (SMIP) smtp.gmail.com timed out. Try again. This keeps repeating. What can I do?

TB 140.7.0 32bit, Windows10 64bit

My email provider implements black-box spam processing, with deemed spam redirected into a "Spam" folder at the server end which by default is flushed every 60 days.

To view all the incoming mail, I now not only need to view the account Inbox as TB presents it, I also need to log in to the provider's Web interface to inspect the account's Spam folder. I'd rather view this Spam folder through the TB interface to avoid extra logins.

So I

(1) Created a Spam subfolder under Local Folders using the TB interface. The Properties function reports its path as mailbox://nobody@Local Folders/Spam (the Inbox path is reported as mailbox://nobody@Local Folders/Inbox). These paths are read-only as presented by the Properties function.

(2) Used the Config Editor to set mail.server.default.check_all_folders_for_new to TRUE.

(3) Restarted TB, verified that check_all_folders_for_new was indeed TRUE.

However, while the account's Spam folder was known to contain 2 entries at the server side, the end-user Spam folder was not populated, whether by way of TB restart or manual invocation of the Get All New Messages function.

Any ideas ?

Thanks.

Hi, So I used Thunderbird to create a zipped backup file of my profile. I got the warning that if the file size if more than 2 GB I may want to make a manual backup. I proceeded, and ended up with a file that was 15 GB. I then uninstalled Thunderbird, reinstalled it, and tried to import my backup file. Thunderbird gave an error, saying the file is too large, and I should manually extract it. Okay, I tried, but Windows 11 failed to extract the file. I then used a third-party app to extract the files. This gave me a c2140ucr.default folder that contained three direct subfolders and many, many files. I located my inbox.ca file, which is what I really want, but I cannot find a way to import it into Thunderbird using the Tools menu. Any ideas on how to recover my previous profile would be appreciated. Thanks.

Hello, I just enabled the backup sync option for the Firefox web browser (Win 10). What is the equivalent process, or recommended method of enabling a backup for mail folders, calendar entries, address books, settings, etc. of the most current Thunderbird version on a Win 10 PC? I could not find a clear answer in the help forums. Thank you.

Dear community members, Since receiving the Thurderbird release 140.4.0esr on Oct 14th, I have not been able to send email from any of my accounts (2xIMAP and 3xoffice365 through OWL). Nothing has changed in the account settings. Receive works ok. The usual easy fixes do not seem to work (restart, firewall switch-off, etc.). Any ideas beyond having to rewind to an earlier version and rebuild the whole thing (hopefully not!)?

Version 140.4.0esr Build ID 20251010020716 User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:140.0) Gecko/20100101 Thunderbird/140.4.0 OS Darwin 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:30 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6020

Thank you for your help! Heli

I am using TB 140.7.0esr(64bit) on a windows 11 desktop/ Starting 15 Jan at ~ 8pm, my outgoing SMTP email from multiple tds.net email accounts through my default server (tds.net) is failing with the following message: "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: Cannot connect to SMTP server 129.159.94.43 (129.159.94.43:587), connect error 10060." The outgoing SMTP configuration is: "Server name: mail.tds.net Port: 587 User name: john.randle Authentication Method: normal password Connection security: STARTTLS" I have not made any changes to that configuration. I am still able to send SMTP by switching to another email account/server (e.g. gmail.com). I have contacted tds.net and they say, not surprisingly, that it is an email client (thunderbird) issue. I am getting the same error on another desktop running windows 10 with TB 140.6.0 esr (32bit). Any suggestions will be appreciated. Thanks in advance.

I believe that version 145.0, newly installed on the 9th December, 2025 was showing server folders correctly; the server folder name matched the client folder name.

After upgrading to 146.0 on the 10th December, the server folder names for some folders are displaying with different client folder names.

The IMAP account has both "spam" and "junk" folders, Thunderbird is now displaying both as "Spam", you can only determine which folder is which by showing folder properties. It appears to users that there are two "Spam" folders now and not the two distinct folders with their own names.

Similar behaviour is happening for "Sent" and "Sent Messages" folders, both now display as "Sent".

These changes are confusing, the client sees two "Spam" folders and two "Sent" folders instead of the original proper server folder names.

Why has the display name for these folders changed?

How can I get TB to display the real underlying folder names?

Hi, The question is in the title. I have imported my Outlook data in this 32-bits version (updated to 140.7) . I would like to keep them in a 64-bits version (147). I didn't find the solution. Thank you for helping me. Michael.

I am running Thunderbird version 128.11.0esr (64 bits) on Windows 10 Pro. I have defined, in Windows, the default program for .doc and .docx files to be LibreOffice Writer and this works fine when I click on such a file in Windows.

But when I got a docx attachment in a Thunderbird email, and clicked on it, nothing happened. When I right-click on it, it just offers to open (not to select which program to open it with). I have to save the file locally, and click on it in Windows in order to open it.

This is very frustrating, all the more so that it used to work. I tried adding the two following lines to the prefs.js file, to no avail - no change:

user_pref("network.mime-handler.external.application/vnd.openxmlformats-officedocument.wordprocessingml.document", "D:\\Program Files\\LibreOffice\\program\\swriter.exe"); user_pref("network.mime-handler.external.application/vnd.openxmlformats-officedocument.wordprocessingml.document.useSystemDefault", false);

Any suggestions? Thanks!

Hello, In a recent upgrade to Thunderbird Mac OS x146.0.1 (aarch64), the FILTER selection options on some drop down menus are now blank. Example: "Priority" "Status"

These drop down menus now show no options (eg. read,)

I've two screen shots to illustrate.

Thanks for looking into this.

Glenn S

I have just installed Thunderbird v146.0, set up the first mail account (POP3) OK, then tried to set up a GMail IMAP account. I inadvertently gave it the wrong password, so the Account hub throws out the connection with an Authentication error "Unable to log in at server. Probably wrong configuration, username or password".

The problem is I can see no way of amending the password; if I try and set up the account again, it just skips the "enter password" step, presumably because TB thinks it already knows the password for this email account. I have tried the following:

- The "edit configuration" feature in the account hub doesn't have a change password option - The Saved Passwords section in Settings > Privacy & Security doesn't show the Gmail creds, presumably because it failed to set up this account in the first place - I reinstalled TB, having previously deleted the Profiles folder in C:\Users\<username>\AppData\Local\Thunderbird; everything I've read on this suggests this is the one and only place where TB keeps its data. However, when re-entering TB, the POP3 account I set up is still there, so there must be somewhere else that TB is storing its data, I guess the Registry?

Am I missing something? I can't be the only person who has had this problem!

Thanks