Thunderbird Community Forum

How can I stop Thunderbird from displaying its own advertising/donation page on my browser when I open Thunderbird? It opens this page on my default browser, no matter which is chosen: https://www.thunderbird.net/en-US/thunderbird/128.0/whatsnew/?locale=en-US&version=128.6.1&channel=esr&oldversion=102.8.0 If the browser is not open, it will open it.

This is the result of trying to keep Thunderbird from automatically upgrading. In newer versions, the option to choose not to upgrade has digressed from difficult to not available. It did such an upgrade, so I de-installed and reinstalled my original version, only to have this issue.

I was very satisfied with my old version AND see no need for new any of the "features" or look. And, especially, once such a setting is made, don't want Thunderbird, or any other application or app, changing it back. This is a violation of privacy at best.

Worse yet, Thunderbird is attempting to penalize the customer for making a choice on their own computer by infecting the machine with nuisanceware.

Dear Support Team,

I'd like to understand the design of S/MIME signature / certificate validation in Thunderbird. Lets's assume the scenarion that a message with valid signature has been received but the certificate expires very soon (next couple of days).

In my opinion, the behaviour of Thunderbird might be a bit missleading. As enclosed, S/MIME information says that certificate is untrusted, which is not really accurate. The certificate was trusted when the message has been received but now expired.

I assume that Thunderbird validates certificate only against current date. But we have the message original date in the headers. Validation process could be configurable, like in popular pdf readers (which date to use for validation), or even better it could execute 2 validations in case current date validation has not been scuccessfull and S/MIME information could cover this scenario that the signature has been valid while message been created / recived but the certificate expired. It would definitely reflect real scenario in more accurate manner.

I'd appreciate if you could let me know if there is a configuration possibility which I'm not aware of. In case it is not available, can you please advise how I could submit a proposal of functionality enhancement? In case, there are rules comming from RFC standards restricting the validation of signature in a way that has been described, I'd also appreciate this feedback.

In spite of the above remarks, I think that you did a vary good job with S/MIME functionality in thunderbird. It is far more user friendly and well presented to a user than in other email clients.

Best regards, Marcin

After the last update to Thunderbird 139.0.2 on a windows 10 computer, the write button doesn't work. When I click it nothing happens. I receive messages and can even reply to messages I just can't write new messages. The error console shows an error: 1750426957343 addons.xpi WARN Checking C:\Program Files (x86)\Mozilla Thunderbird\distribution\extensions for addons UnknownCollectionError: Unknown Collection "thunderbird/moz-essential-domain-fallbacks"

   UnknownCollectionError resource://services-settings/RemoteSettingsClient.sys.mjs:189
   sync resource://services-settings/RemoteSettingsClient.sys.mjs:635

EssentialDomainsRemoteSettings.sys.mjs:110:15 UnknownCollectionError: Unknown Collection "thunderbird/url-parser-default-unknown-schemes-interventions"

   UnknownCollectionError resource://services-settings/RemoteSettingsClient.sys.mjs:189
   sync resource://services-settings/RemoteSettingsClient.sys.mjs:635

SimpleURIUnknownSchemesRemoteObserver.sys.mjs:114:15

I think I have turned add-ons off and still have the problem.

I have about six email accounts on my Thunderbird. One is associated with my internet provider. The rest are related to my website server. All of the accounts. except one, are working fine. The one that isn't working somehow lost its password. Its an account related to my website. For a while I could get incoming mail but I couldn't reply. I changed the password at my web host, and now I can't receive or send.

What do I need to do to restore this mailbox's functionality?

Many thanks for your suggestions

Добрый день. Нужна срочно Ваша помощь. К нам пришло сообщение от почтового сервера mail.ru Что нас заблокируют с 24/06/2025 числа. Мне поддержка написала, чтобы скачать с облака почту на компьютер нужно установить почтовую программу и перечислили их в качестве примера. Я установил на свой комп Thunderbird. Создал локальную папку на компе у себя. И запустил программу, чтобы прогрузились все письма с сервера. Оставил на сутки. Потом выделил в папке входящие все письма и нажал кнопку архивировать в локальную папку. Тоже самое сделал с отправленными. В итоге сейчас на сайте начали пропадать исходящие письма и входящие. Входящие резко пропали за 25 год до 20 Хотя я ничего еще не удалял. Думал прогружу почту всю с 18 года в локальную папку на комп. Скопирую ее Архив еще раз отдельно и удалю только с облака до 21 года, чтобы освободить место в облаке. Но тут происходят чудеса. Помогите пожалуйста. Как все восстановить и сделать правильно. Готов предоставить доступ через Ани деск

A week or two ago I started having two problems with Thunderbird, but only with some emails related to my clients. Here is a description of each problem (in case the problems are related):

Doubled incoming emails

Emails received at my address david@nsrusa.org are being received and displayed twice. I have set both my email domain servers to delete messages from the server, which is the top advice always given for this problem. The advice doesn't work for me.

Outgoing message failure

Some messages I send using Reply (perhaps the doubled messages) are getting "stuck" in my email server, which keeps sending me updates on this failure. Here is the start of a typical failure message:

This message was created automatically by mail delivery software. A message that you sent has not yet been delivered to one or more of its recipients after more than 48 hours on the queue on server.springtimesoftware.com.

The message identifier is: 1uQFjK-00GA1j-05 The date of the message is: Fri, 13 Jun 2025 21:30:45 -0400 The subject of the message is: Re: Your recent postings

The addresses to which the message has not yet been delivered are:

 ***@bol.com.br
   host mx3.bol.com.br [200.147.41.201]
   Delay reason: SMTP error from remote mail server after RCPT TO:<***@bol.com.br>:
   450 4.7.25 Client host rejected: cannot find your hostname, [69.48.183.241]
 ***@gereconsult.com
   Delay reason: H=mx-vip-01.kinghost.net [191.6.216.38]:
   SMTP error from remote mail server after RCPT TO:<silviomartins@gereconsult.com>:
   450 4.7.25 Client host reje

My environment: Mailservers are mail.nsrusa.org and mail.springtimesoftware.com, both at IP address 69.48.183.241, Windows 11 Home 64, Thunderbird 128.8.1esr 32 (I have just updated to 128.11.1esr), hp laptop.

I have a rule that moves email messages from backups to a 'Backup' folder. I also have another rule that moves emails address to myself to 'My Mail'.

When I start TB 128.11.1esr in the morning my 'Backup' and 'My Mail' folders show new email counts. When I click on 'My Mail' the number on it decreases and 'Backup' increases. This happens with other rules on other folders.

So, my question is this behavior caused my 'Message Filters' being triggered when I click a folder or potentially a latent refresh of the folders new email counts.

Thanks

Hello Team, I installed thunderbird yesterday and so far its looking promising and actually I started to like it. But when on my first email draft I tried to use search and replace (Ctrl + h), I was not getting any highlighted letter on pressing 'Find Next'. When I press on 'Replace' still 'Find Next' button is highlighted and also nothing seems to be replaced. It is only when I close the Find and Replace window I see my changes. I am attaching picture for your reference. If this is not standard feature then please provide support to fix this issue.

Will Thunderbird Release make it any easier to migrate Thunderbird from Win10 to Linux (Ubuntu or Mint)... With 200 million PCs becoming obsolete in a few months, I would think Mozilla would have noted that many of us are going to migrate to Linux but moving Thunderbird has been a nightmare (still unsuccessful nightmare). I've followed all the directives and none seem to work... I've been using TBird since it started and have a LOT of emails I'd prefer not to lose so if I could just get my Windows profile to work on Linux it would be great... I know you're busy, but we are facing an Armageddon of sorts out here... Help! Thanks a million cheers pj

Search stopped working on my Windows 11 and Android platforms. I deleted the global database and restarted Thunderbird on Windows 11. Problem solved. Unfortunately, on Android, no joy.

My password is not being accepted, so I'm not getting my mail. For quite awhile my password would sometimes not be accepted for sending email, but now it's for everything. How can I fix this?

Just installed the latest 139 version on two computers, the system tray icon for unread messages appears in Windows 10, but not in Windows 11, and it isn't just 'hidden' as I have many icons hidden and just a few visible and have already checked that. Is the icon no longer part of the program?

15.18.0 how to export to mobile from settings in the desktop thunderbird so i can use my android phone--if it will help, on my desktop there is no Export to mobile in settings!!!!!!!

how can I copy my encrypted gmail passwords so that I can use it to sign into my Thunderbird gmail accounts to send and receive email using the Thunderbird app? Thunderbird has now decided that the passwords I have used for years to sign into my two gmail accounts are not valid. Think Tbird wants the encrypted version of each password, but don't know how to figure out what that is. Not listed in the encrypted version in my Tbird saved passwords.My other accounts continue to work well with Thunderbird. I havve many folders that I do NOT want to lose i I have to delete and then reestablish those two accounts, but the copy/move to another folder on my laptop will not work. Nothing happens when I try to follow the instructions. Please help!!

I use Thunderbird on my desktop and laptop, both Windows 7, with 3 Gmail accounts. Recently I started having problems with one account on the laptop but not on the desktop. Settings for all 3 accounts are/were identical. I deleted the one account and tried to add it again: with following error message:

     "Unable to log in at server. Probably wrong configuration, usrname or password.

I then added account manually without a password. I cannot access the email account and dont get an option to enter password and error is:

    "Sending of the message failed.
     The message could not be sent because connecting to Outgoing server (SMTP) .gmail.com failed. The 
      server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server 
      (SMTP) settings are correct and try again."

Yes SMTP setting is correct

This message also pops up:

    "Authentication failure while connecting to server imap.gmail.com"

I have no problem accessing all 3 email accounts on my desktop or phone either Please assist

Re: 128.11.1 esr (32-bit) Curiously, without settings having been changed and only since last 2-3 updates, my unified inbox listing comcast.net and netscape.net mail will not show the netscape.net incoming unless it is actually READ in its separate inbox. Periodically, duplicate messages do now appear, but without the new, un-opened netscape mail. This duplication is corrected by exiting the app then re-starting it, but the new mails still are not listed in the combined unified format, nor are they, for that matter, in the ALL format. Wassup wit dat?