Thunderbird Community Forum

Hi, I have moved to a new computer and transferred my Thunderbird account to it without any problems. However, I wanted to do a backup of my profiles, etc, but the old Thunderbird backup link no longer works. Has it been discontinued, and if so, what replaces it?

Hallo, ich hatte ein Password verdecken, aber mache ich nicht mehr. Ich wolle das Password loschen, das geben aber nicht. brauche auch nicht nehnen Password. Bitte helfen, danke. Andrea

I installed Thunderbird on a new device by connecting it with my windows notebook. Everything works fine, however, the address book is missing. Can I copy this " by hand"?

Добрый день! Перестали отправляться письма smtp.gmail.com. Получаю письма без проблем, а при отправке ошибка

Ошибка отправления сообщения. Сообщение не может быть отправлено, так как не удалось установить соединение с Сервером исходящей почты (SMTP) «smtp.gmail.com». Сервер может быть недоступен или отказывать в соединении по SMTP. Убедитесь, что указали корректные параметры Сервера исходящей почты (SMTP) и попробуйте снова.

соответственно пробовали настройки исходящего сервера и starttls\587\oauth2 и ssltls\465\oauth2 - ошибка одинаковая. Проблема появилась только сегодня, до этого всё работало. Из браузера письма отправляются без проблем. На другом ПК С Тандербёрдом с этой почтой такая же ситуация. Почта других доменов отправляется без проблем.

I have several accounts in Thunderbird - all but one are working fine. I have 2 Outlook accounts and 1 has suddenly stopped working. All the file folders under the account name disappeared. When I restarted my computer, an "in box" reappeared but no other folders and the inbox was completely empty. I can still access this Outlook account on line however. I have searched the web for advice and tried all the basic fixes including updating to latest Thunderbird version but still cannot access the account.

Without client certificate configuration, the user can retrieve its emails on the dovecot IMAPs server using a password.

When I try to authenticate the user with an S/MIME client certificate, the dovecot server reports that: ```dovecot: imap-login: Login aborted: Connection closed (client didn't send a cert) (client_ssl_cert_missing)```

Here is the configuration: 1. On the client side: I've imported into thunderbird: - the self-signed CA certificate - the user's S/MIME client certificate which is fine: ```

1. pk12util -l user@example.com.p12

Enter password for PKCS12 file: Certificate(has private key):

   Data:
       Version: 3 (0x2)
       Serial Number:
           00:c3:10:d5:01:d1:9c:3c:4c:26:a7:a9:4d:90:f0:49:
           03:a8:f3:71:d6
       Signature Algorithm: PKCS #1 SHA-256 With RSA Encryption
       Issuer: "O=Example,ST=Yvelines,C=FR"
       Validity:
           Not Before: Mon Feb 23 14:26:26 2026
           Not After : Thu Feb 21 14:26:26 2036
       Subject: "E=user@example.com,CN=user@example.com,O=Example,ST=Yvel
           ines,C=FR"
       Subject Public Key Info:
           Public Key Algorithm: PKCS #1 RSA Encryption
           RSA Public Key:
               Modulus:
                   c7:f9:af:0a:53:72:a9:de:f0:db:bb:ad:86:90:15:f1:
                   ...
               Exponent: 65537 (0x10001)
       Signed Extensions:
           Name: Certificate Basic Constraints
           Data: Is not a CA.

           Name: Certificate Key Usage
           Usages: Digital Signature
                   Non-Repudiation
                   Key Encipherment

           Name: Extended Key Usage
               E-Mail Protection Certificate

           Name: Certificate Subject Key ID
           Data:
               68:5f:60:6d:8b:c8:0c:28:e3:d9:49:ca:bd:c7:25:a0:
               24:4c:2c:40

           Name: Certificate Authority Key Identifier
           Key ID:
               00:eb:69:5d:78:80:7f:1b:7f:e3:2b:fa:15:c3:9b:e6:
               68:98:fa:f6

           Name: Certificate Subject Alt Name
           RFC822 Name: "user@example.com"

   Signature Algorithm: PKCS #1 SHA-256 With RSA Encryption
   Signature:
       71:1b:e4:78:b0:21:f7:20:78:50:80:87:c8:71:a2:9c:
       ...
   Fingerprint (SHA-256):
       7F:8D:00:DF:04:02:39:90:11:B2:7D:5F:D3:EE:A7:2D:EF:58:B3:A9:4B:79:ED:D5:FE:2A:70:74:06:33:ED:31
   Fingerprint (SHA1):
       4E:7C:3B:31:58:32:8A:C3:42:26:CB:D3:DB:54:95:C5:C1:06:19:14

Key(shrouded):

   Encryption algorithm: PKCS #5 Password Based Encryption v2 
       Encryption:
           KDF: PKCS #5 Password Based Key Derive Function v2 
               Parameters:
                   Salt:
                       f2:73:28:5b:0b:6c:36:ec:1f:ca:1d:19:b3:77:87:7e
                   Iteration Count: 2048 (0x800)
                   KDF algorithm: HMAC SHA-256
           Cipher: AES-256-CBC
               Args:
                   04:10:be:da:bb:10:d3:94:e0:82:b3:2b:c2:ad:39:b5:
                   3b:4e

``` I've setup the account to - use its certificate - use a TLS certificate as an authentication method. There is no S/MIME certificate option.

2. On the dovecot (2.4.1) server side: The server is configured to require client certificates for all IMAP connection: ``` protocol imap {

 ssl_server_ca_file = /etc/ssl/CA_CRL.pem
 ssl_server_request_client_cert = yes
 ssl_server_cert_username_field = commonName
 
 auth_ssl_require_client_cert=yes
 auth_ssl_username_from_cert = yes

} ```

Does that mean that I also have to import a TLS client certificate? If so, what format should it (.p12, .crt...) be?

Why does the spellchecker have to check the original message, as well as the reply? The original message always shows errors, if only because the sender's email address isn't in the dictionary or the sender didn't bother with capitals, showing his name as "jeff", instead of "Jeff". I end up clicking Send Anway every single time.

Very little to do with accounts, but none of the selectable topics cover 'user Interface'.

Used to be able to open different accounts in different windows. Can't remember how, but it was obvious. Once new window is created, each time Thunderbird is started it re-creates them. I accidentally closed one and can find no way to re-open it. I use three email accounts each needing a different mindset, so keeping them in different windows helps. Also one has a screendepth full of folders and so is easier to handle in its own window. (The others are still there but only take up one line each when collapsed.

140.7.1esr (64-bit) Mozilla Thunderbird Snap for Ubuntu ubuntu-snap-build - 1.0

Hello, so finally this happens to me too. I lost all my emails in Inbox before August 2025. I think it happened after one of these usual alerts 'you should compress emails'. I did this in the past 6, 7 years and nothing was lost so far. I also have plenty of space on my computer, that's not a thing. I tried a couple things I found in web but doesn't help. Couple emails that I had for example in an 'important' folder are still there. I'm really annoyed. I didn't had a glue at all that this compression alert will delete files in the inbox one day, only those in the trash box. Maybe there is a last chance to get them back but I'm afraid that they are gone forever and I will put everything from my inbox into an other folder in future or maybe even better go back to Apple Email where this never ever happened in the past 25 years.

Thank you, Chris

In one folder, one message received on 20th Feb keeps altering its date/time so that it appears AFTER replies I've sent in response. This has occurred following a problem with the same folder where several emails went missing, which I managed to restore with the Repair Folder function. Thought I might try looking in the file (not the MSF, the other one), but it's far too big for any text editor to open.

Sadly Thunderbird often hangs, particularly if a network disk goes down. It is a strange hang, with the Inbox shown when hovering the task bar, but selecting it does not open the window. I have been observing this for perhaps 6 months.

In the past, it was sometimes possible to Close Window, else End Task, but neither have any effect. It seems that End Task is disabled.

Consequentky when Thunderbird hangs, the only way to restore Thunderbird functionality is to tidily close all other applications, restart Windows, which fails, hold power button for 5 seconds, then manually start again.

Why isn't Thunderbird killable?

i cant send email from X@comcast.net, Y@comcast.net or Z@comcast.net

(PII redacted by moderator)

I have several Windows 7 computers running Thunderbird and have 13 POP3 accounts to retrieve. These computers work fine. It takes about 5 seconds to check all 13 accounts if there is nothing new to download. I have two Windows 11 computers that take about 50 seconds to go through these same accounts under the same conditions (nothing new to download). I have done a lot of searching for answers, but nothing helpful has come up. Any ideas on what might be causing this? Seems like it would be a common problem as both Windows 11 computers do the same thing. Both are Windows 11 Pro. Thanks for any guidance.

Couple days ago my Thunderbird stopped connecting to Gmail POP server, returning an error that the server is unavailable. The Thunderbird version was way too old and didn't have OAuth2 option, so I updated to the most recent version 140.7.2esr. Nevertheless setting OAuth2 didn't help.

Then I deleted completely the Gmail account and all saved passwords related to it and created a new mail account for Gmail from scratch. But connecting is still not happening.

Receiving of cookies is enabled. The parameter javascript.enabled is set true. What else can be checked for possible cause of the authentication denial at Gmail's side?

I believe I'm on the newest release. I'm not low on disc space and I don't know how it would suddenly not have write privileges. I was archiving some of last years emails and it stopped shortly after that.