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The OAuth2 authentication process starts normally. However, after I click "Allow" in Thunderbird to grant access to my Gmail, I encounter an error stating: "Failed to establish a secure connection to localhost." The specific error code is SSL_ERROR_INTERNAL_ERROR_ALERT.

I have already tried adjusting settings related to cookies and JavaScript, but it didn't resolve the issue.

Hello.

I have added a new account to Thunderbird, and it is not syncing to show new messages. I am getting a pop-up from Tbird saying "The certificate for mail.newcreationloughborough.uk is not valid for that server ..." etc. I have gone through the procedure titled 'Troubleshooting email client warnings about invalid server certificates' to add Norton's certificate to my email app (as directed by the 'resolve' link in the 'Resolve email sync issues caused by certificate warnings' from the Norton EE Cyber Security add-on), and it tells me that the certificate is already installed.

What can I do next to get it to sync?

An upgrade a couple of years ago resulted in the top-listed reminders having a dark blue background that making it unreadable. I have been told by Tbird support that 'this is a known issue' but, after many upgrades since, it has not been fixed.

Much thanks in advance for any suggestions for fixing this.

From Microsoft: "Recent Outlook Mobile updates introduced a stricter and more standards-aligned S/MIME message structure. The messages themselves are valid, but some third‑party mail clients such as Thunderbird do not fully support the way Outlook mobile structures the encryption. As a result, these clients may display a blank message body even though the encrypted content is present.

As a workaround, if you need to send encrypted mail to recipients who use third‑party clients, use Outlook desktop or Outlook on the web instead of Outlook mobile. These versions generate encrypted messages in a format that is more widely supported. "

I couldn't find this reported anywhere in these forums. Is there a solution being worked on to address this issue? Or has anyone found a workaround? We are stuck with using the Outlook app until the Thunderbird app supports S/MIME.

Hi! I need your help! No one I know uses thread grouping in the mail list. Except for one person who asked me for help. I checked, and I have the same problem: Thunderbird 140 ESR doesn't save the expanded or collapsed status of threads. Even changing folders and returning causes all threads to be collapsed or expanded (depending on the last expanded/collapsed all hotkey pressed). A friend claims that everything was saved for him before. I tried resetting the global index, but it didn't help. Please, if you know the setting responsible for this, or know the correct behavior for Thunderbird, let me know.

Hello,

I have problem with this following message: authentication failed when connecting to imap.gmail.com. Nothing changes in my computer but Thunderbird from today 14:00 displayed this message and is not possible read new messages - it looks like not possible to load the message text.

Thank you

Enough is enough—every update brings problems, crucial add-ons stop working, and now drag and drop attachments have stopped working. It's really inconvenient. Maybe it's time to stop this nonsense and implement paid subscriptions or purchases, but in a way that makes everything work.

Hi, I want to print a list of selected events in the calendar, is that possible? Or, is there an extension that does it? And in the dream scenario I could export the selected lines to Excel.

//LasseT

I use Thunderbird 145 on Ubuntu and try to use the new Exchange option. It recognise the account as an Exchange account but no password entry dialog is showing. I have switched to Auth2 too and if I try "Get Messages" an error pops up.

Thanks for support

Buongiorno, ho sempre usato questo programma ma, per ragioni logistiche, ho cambiato password da legalmail alla mia pec. Non riesco più a configurare la mia pec su mozilla thunderbird da quel momento poichè mi dice che l'autenticazione al server non è riuscita. configurazione,email o password errati. Come posso fare? Grazie

Hello fans of Thunderbird and W10 32 bit, I have maybe a luck day today and I have found, where Thb has saved my enclosures .. my and maybe Thb and W10 32 bit problem is, that I cannot tell Thb, where it has to save e-mail enclosures, so Thb saves them to temporary folder of W10 32 bit ... user\...\AppData\Local\Temp\... (W10 jungle folders) ... There is a simply manual, how I can save today one my enclosure on attached image ...

Hi,

Thunderbird 140.5.0esr started acting weird with my Pop3 account. Normally it downloads all the messages (300-500 daily) and then deletes them from the server, as expected. However, during the last few months I have experienced 3 issues. In all, TB starts the downloading, than pauses at some point (like "Downloading 189 of 291") then ends the downloading process. At that point I have some of the downloaded messages in my Inbox, and ALL of the messages are at the server too. If I restart the downloading again, I end up with duplicate messages in my Inbox, and all the messages still at the server.

I, than, have to identify which messages have been downloaded, delete them from the server manually (with IMAP client) and start the downloading process on TB again, and this goes on until all messages are downloaded.

Any suggestions ? How can I troubleshoot this issue ?

Regards.

In both my Inbox and my saved email folders, when I click on an end-to-end encrypted email, Thunderbird (v145) displays "Loading Message..." and then blocks with a spinning blue "working" cursor for on the order of 30-60 seconds. The Thunderbird dialog then appears to make some progress, as the windows seems to "flash" as if it's being cleared, but the email content doesn't appear. After about another 20-30 seconds, the encrypted email contents appear, correctly decrypted.

This long delay only occurs when I click on encrypted email messages, and it happens every time I click on an encrypted email message, and this behavior only started occurring in the past couple of days (correlated, I believe with Thunderbird updating to v145) so I think it's safe to assume the issue is with end-to-end encryption/decryption in Thunderbird v145.

Thunderbird can receive emails but I cannot send them. I get the error message per the screenshot below concerning SMTP.

I have a MacBook Air with Mac OS Sequoia 15.7.2. The error started yesterday (21 November). Just finished conversing with Optus support and they say that it's not at their end: webmail works okay, can receive email and send it (will note there was a brief hiccough earlier today when could not send from webmail, but okay now). All settings as recommended (port for incoming server actually different from what Optus recommends, but when I changed it from 995 to 110, Thunderbird stopped being able to download emails, so changed it back again. Port for outgoing is as recommended, 25.) I tried lowering security, as suggested by Thunderbird help list, and no change so restored it.

I have the latest version of Thunderbird for Mac, 145.0.

My partner, who also uses Thunderbird, cannot send emails either. He has an older Mac running an older OS.

I have included two images, the second one showing details of selected server. When I clicked 'fetch certificate' it failed. Does that signify anything important?

The error console shows a lot of information, which of course I cannot understand, but can screenshot some of it if that would help.

No firewall, no virus protection, no VPN.

Any ideas as to what might be going on?

I have tried to set up an import from my gmail account to my thunderbird account but I always get an error message saying wrong configuration. How do I get this account set up? Buck

My Inbox folder has suddenly dropped to second last position in the folder list. How can I get it back to the top of the list? Is it possible to move the folders around?