Thunderbird Community Forum

Good day support team, I had this sending message error show on my Thunderbird desktop when I try to send Annual Report to my members. I had tested to send through Bcc to 50 recipients and not sure how many is going through or not even one is going through. This is due to the over limit of the recipients I send through Bcc or recipient "bcl5157@gmail.com" account as show on the attached screenshot picture had problem? For this scenario, is it better to create a Mailing list instead?

Thank you in advance.

Regards Jim

The details were given in my question. I am receiving the following message in all my incoming e-mails and have no way of replying to the sender because REPLY and REPLY ALL no longer appear in my Thunderbird e-mail task bar. Here is the message I receive with each incoming e-mail: "A unique identity matching the From address was not found.. This message will be sent using the current From field and settings from identity lonearranger <lonearranger@telus.net>" How can I get rid of this message and go back to seeing REPLY and REPLY ALL in my task bar?

サンダーバードで受信は出来ますが、送信ができなくなりました。 「メッセージを宗しおんできませんでした。 送信（SMTP）サーバー******に接続できなかったため、メッセージを送信できませんでした。サーバーが利用できないか、SMTP接続が拒否された可能性があります。送信（SMTP）サーバーの設定が正しいか確認し、再度試してください。」と表示されます。SMTPサーバーを編集してみましたが治りません。どうすれば良いですか？

My windows 10 Desktop C drive failed, this has been replaced and I am trying to re-install Thunderbird but I can't complete the install due to the error message shown above in my question. Please advise.

My provider changed from q.com email to myctl.net email. I was using outlook but it wasn't downloading new emails. They are on provider web mail. When I downloaded Thunderbird it asked about importing from Outlook and I did. Now it is trying to download the 36,000 emails on the server site and going very slowly and I can't open the ones it has downloaded, I think because it was sent to q.com. Can i uninstall Thunderbird and then set it up again without importing anything?

The user who found she could not run the new version was the user who installed the update. She returned to the previous version (which runs OK). As before the update, server access was via Pop. However her Sent and Local Folders did not appear at all on return to the earlier version and her Inbox now contained only a few recent emails from this year and emails from several earlier years was missing. She set up a second account using Imap in order to be able to retrieve all her incoming mail from the Virgin server but is still without sent mail and her local folders.

Is there any way to retrieve the missing data and to combine the IMap and Pop accounts into one?

We have asked this before, and we still are not able to resolve it at all. Several items: We have two email addresses used by Thunderbird, for many years. [email1]@apaltd.com and [email2]@apaltd.com. Since the last "update", some many months back, her account has had TWO "sent" items/boxes, and they do not have the same items in them as "Sent". We tried to get rid of one, but to no avail. Also, the headings used to have features that showed "dates" in order and other normal things that we used all the time. Now these are gone and we have no idea how to get then back to way to the way opening page was originally, and we are seriously thinking about how to use another service, however we have been happy Thunderbird users for many, many years and need to return the site to its original layout. You folks have tried to help before, but none of the advice worked (i.e, right click on one of the sent boxes to remove it) We are reluctant to simply re-install Thunderbird lest we lose all our other data. We are at a standstill and need advice and help as soon as anyone can help. If any more information is needed, we will happily supply it. Thanking the community in advance for any help/solutions. Charles and Penny Kindt

Message sent has red texts (all containing an hyperlink). When vizualized in Thunderbird they all appear in blue. When vizualized in Gmail they appear in red! Texts written in red in Thunderbird messages still appear in black in draft's message!

I’ve tried all versions of Thunderbird on my 2020 M1 Mac, and even though I log in correctly, it doesn’t load emails from my account. I used to use Thunderbird normally because I needed it, but I haven’t used it for two months, and now I see that it doesn’t work when I try to connect to my email. It connects to my email normally, but the problem is that when I click on “Inbox,” there's nothing there, and when I click “Fetch Mail” to try loading it again, a message pops up at the bottom saying everything is fine, but in the end, I still don't have those emails. What kind of error is this?

Hello and thank you! When I print emails on our A4 (210x297mm) paper, to which the printer dialog is set, only the bottom half of the header, and top half of the footer, are printed, at the very edges of the paper. This doesn't 'feel' like a printer setting, but more of a Thunderbird setting, for if I set the paper size to US Letter, the footer prints 15mm from the bottom, but still only the top half of the text appears (truncated at the waist). Can you help?

My email was originally set up with Brighthouse which was acquired by Spectrum. My email address has a cfl.rr.com extension. Because of a hard disk problem, I had to reload Thunderbird. Spectrum is still maintaining the old Brighthouse accounts but support is extremely limited.

I can now get into my account in Spectrum's email and can send and receive email there. I had to use a password I set up for Spectrum to do that. But Thunderbird will not recognize my cfl.rr.com account. I can import that account into Outlook and Gmail, but not Thunderbird. It appears to me that Thunderbird is looking for a password that Outlook and Gmail don't require. If I had an old Thunderbird or cfl.rr.com password I have lost it.

I prefer Thunderbird, and I need to get my address book and history files back. I have just set up a new email account in Gmail and imported it into Thunderbird. Is there a way I can I recover my old address book and history files? I do have all the old Thunderbird files that I backed up before I had to reload Thunderbird.

I have been using Thunderbird with two POP3 Hotmail accounts for some time and I am trying to set up a third account with exactly the same configuration. However, both the automatic and the manual configurations failed. The new account receives mail, but the outgoing smtp server config seems to have a problem. Sending messages times out or keeps prompting for a new password.

The Hotmail account has POP3 and IMAP enabled. Thunderbird is set to receive all cookies. I cleared history and cache after every attempt and also temporarily disabled the firewall.

Any suggestions about what the problem could be?

Hi, I'm tring to rearrange the order of my email accounts in the left hand pane. The FAQ says sandwich icon -> account settings -> move them around in the desired order. This looks OK in the account settings list when I do that, but when I close it, the accounts order is as before, and this order shows up again when I re-open the account settings list. Is there any way to make this "stick"? Do I need to click some hidden Confirm button? Many thanks in advance!

Thunderbird version number: 148.0.1 Mail provider: Yahoo Client OS: Windows 10

The issue and steps I tried to resolve: On 1 Jan 2026 I switched from Outlook client on my Windows 10 PC to Thunderbird 146.0.1. I did not import any user data from Outlook but started with a clean install of TB for the new year. I use yahoo.com with POP3 as my email provider. Server Settings: Server Name "pop.mail.yahoo.com", port 995, SSL/TLS, OAuth2 Outgoing Server: Server Name "smtp.mail.yahoo.com", port 465, SSL/TLS, OAuth2

it all worked fine and I was very happy with the setup. Then from early to mid-February I was unable to use my computer. When I finally accessed Thunderbird again, it connected to Yahoo and showed that approximately 800 email messages would be downloaded and started downloading them. After downloading about 100 messages, Thunderbird timed out and I haven't been able to get it to work since.

I have read and followed or tried to follow these articles plus others that I may have forgotten about (not listed in any particular order) - OAuth2 Authentication for Yahoo, AOL and ATT | Thunderbird Help - including all the steps in Please check the following before asking for support - POP access settings and instructions for Yahoo Mail | Yahoo Help - Automatic Account Configuration | Thunderbird Help - Manual Account Configuration | Thunderbird Help - Thunderbird and Yahoo | Thunderbird Help - Send and receive messages in Thunderbird | Thunderbird Help - Can no longer get emails | Thunderbird Support Forum | Mozilla Support - Emails suddenly stopped downloading to Thunderbird 140.2.1esr | Thunderbird Support Forum - Get Messages | Thunderbird Support Forum | Mozilla Support - Cannot receive messages | Thunderbird Help - Problem with Thunderbird working with Yahoo Mail acccounts. | Thunderbird Support Forum

I have removed all messages from the Yahoo inbox and tried to find one or more messages that may be affecting the download. I don't know the best way to determine that.

I use Windows Defender for my antivirus. I don't see anything in Defender that blocks or scans email messages which would prevent downloads, although I could be wrong about that. if this might be the issue, please provide some guidance about how to check Defender.

I have uninstalled and re-installed Thunderbird. In the process I downloaded the setup file for Thunderbird Setup 148.0 and installed that version. It later auto-updated to 148.0.1. Before installation, I removed all external connections from my Yahoo account and completely removed Thunderbird from my PC, including the profile and profile.ini. When I reinstall and switch the account to POP3, Thunderbird captures the App password from Yahoo and connects just fine. But it still times out while attempting the first download of a message. The first several times it timed out, an error message was displayed but now it doesn't show anything. Except no messages are downloaded.

At this point, I don't know what else to try. Since I don't have much experience with Thunderbird, I don't know how to troubleshoot the process (logs to look at, etc.). I don't want to go back to Outlook but I need the email client to work and download messages. Any help would be much appreciated.

I have a lot of message filters that I've created over the years to filter out SPAM (as well as other more positive purposes like sorting mail to specific folders). I'd like to clean out the ones that are obsolete.

If I choose Tools > Message Filters, I get a display window on the screen with some of my message filters shown. But the reason it's "some" is that the top and bottom of the window are well off the screen display. I can double click on a Filter and edit its details and I can delete a filter by pressing the delete key. But I can't scroll through the list. Any filters that are out of range are not accessible.

Is this a bug I need to report? Or am I missing something?

Hi,

I have three outlook.com email accounts configured. Two accounts open to show all subscribed folders. One account shows the account name only, but no folders.

Activity manager shows: "The current operation on 'Outbox' did not succeed. The mail server for account wasaga72@outlook.com responded: Command Error. 12"

Sometimes all folders show. Sometimes all folders show after a delay.

Tried: 1 deleting all .msf files. 2 removing and re-adding the account

My wife and I both have identical Laptops with the same three outlook.com accounts. Mine using version 148.0.1 (64-bit), hers using 140.8.0 esr (64-bit) both have the same problem.

Any help would be appreciated,

John

The University of Minnesota makes me change my password for their email IMAP server every year. I use Thunderbird as my email client. I have not had problems in the past, but this time Thunderbird does not connect with the UofM server and I cannot update Thunderbird with my new password. When Thunderbird tries to connect, I get a Google "help" message about clearing my Chrome cache that does nothing. I deleted the old IMAP password in Thunderbird, but that did no good. Is there a way to update my credentials within Thunderbird?