Thunderbird Community Forum

Hi currently on version 153.3.1esr 64 bit

Bug

Refer to uploaded images for reference.

When creating a "New Event" I select "No reminder" save and close but reminder is still active and icon appears in the calendar next to the event.

I have to then edit the event and change the setting which has somehow changed from my selected choice of no reminder to custom.

Sorry - first post here - hopefully I followed protocol.

Hi,

In my one account in Thunderbird, I still have the old POP folders, that was a different account. I also have an IMAP account, both have the same address. The pop one does not work but the folders are there, I use them to look old mails up, so far so good. When I sent out an email with my IMAP account, the sent mail goes into the sent folder of the IMAP account, so far so good. BUT when I click on that sent mail and click on reply, it replies to the same address that what it already was sent to, now here comes the problem. THAT copy of the mail, I called the NEW sent, does not go into my sent folder. It goes directly into the sent folder of my old pop account. Even though everything on the IMAP account is standard, re-sent mails are not placed in the IMAP account sent folder. What am I doing wrong here, I know when writing the mail is that I can choose the send address and if I change that it goes in the IMAP sent folder but why is it standard on my old POP account, and why not on the IMAP account even though the IMAP is the standard?

September 24, 2026 Hello. The Mozilla Firefox express connect to email icon on the taskbar shows a superscript of 2. I have no unread emails in either of my mail accounts. What is the 2 indicating? It has been like that for a couple of days now. Please help. Thank you. Helen

In the last week or so, Thunderbird has become unreliable about opening - sometimes it opens with no problems, sometimes not. Sometimes closing the VPN appears to solve the problem, other times not. Sometimes opening the VPN appears to solve the problem.

Overall, I'm looking for a new email client after years of using Thunderbird.

Comment créer une nouvelle liste de contacts de type excel.

Rmq générale ... Thunder évolue et c'est bien. Apparaissent de nouvelles propositions et sous-programmes / nouveaux noms sans les définir préalablement , ce qui suscite la méfiance.

Is there a way to update existing calendar appointments by using an updated ics-file? We have appointments that are placed in the Calendar of Thunderbird, and there need to be modifications made over time. These appointments can be in the past, present, or in the future.

When trying to import a modified file, by just updating 'DESCRIPTION', and using the same ID, Thunderbird throws the error of: mail.import: : ID already exists for addItem

   onError resource:///modules/CalStorageCalendar.sys.mjs:203
   adoptItem resource:///modules/CalStorageCalendar.sys.mjs:220

CalendarFileImporter.sys.mjs:120:22

We need to be able to access the same appointment, and we do that from an external database.

Version: 156.0 (64-bit) snap on Ubuntu 24.04 LTS

Just got an email from GoDaddy, my domain provider, about Microsoft discontinuing Their Exchange Web Service. My wife uses the web service but I use Thunderbird. Will Thunderbird still work for Exchange email or do I have to submit to Microsoft's extortion and use Office 365?

This is the message I got:

Microsoft will be ending Exchange Web Services (EWS) in the next few months. Your email service is not ending. We're contacting you because your account shows you may be using EWS. If you use a current, supported Microsoft application, keeping it up to date should be the only action you need to take. If you use another email, calendar or backup application, or your organization manages its own connection to Microsoft 365, please review our help article to check whether further action is required.


The deprecation of EWS is currently scheduled to begin in October 2026 and be completed by April 2027.

I'm assiting an elderly user of Thunderbird. We were trying to update his saved password but the menu items did not match my current version 153.3.1esr. When I asked him to check his version he had options to update from v52. He went through 3 update cycles to v78 when all his data had disappeared. I found some information at: https://support.mozilla.org/mk/questions/1312391 which seemed to put the issue at a file format change in v78. When he looked at the profile folders the most recent was created in 2024. (I couldn't get him to find a modified date more recently.) When he closed Thunderbird and used the Run command "Thunderbird.exe -P" we couldn't find a way to select that most recent profile folder. Are you able to give me instructions I can use in a Windows remote (quick) assist session to restore his data from the profile folder?

Alternatively, is it possible to downgrade back to v68 of Thunderbird; would this restore his data (account settings, emails, contacts/address book etc?

Thanks in advance for any guidance you may be able to offer.

I apologize for the subject line, but there is no better way to describe the problem....

I've been using Thunderbird for a few months now and it has mostly worked well. Then this afternoon I was reading my mail in the Unified Inbox and I noticed something very odd. I had a number of emails showing in the header list with the same "From" and various subject lines. On the face of it, that wouldn't describe any weird behavior except that I noticed the subject lines absolutely didn't match the "From" information.

As I would go to read these emails, the email itself would be correct in the preview pane -- including showing the correct sender name and email -- but the "From" information in the header list pane would still be wrong.

I'm sorry that I can't post a screenshot to make this more clear because there is just too much personal information on screen. But these emails are from several different senders, received by several different email accounts. Everything is correct except that the "From" shown in the header pane is wrong. This is very obvious to me because I normally run entirely in the Unified Inbox with the emails sorted by the "From" information

One example is an email that is actually from "U.S. Department of Veterans Affairs <do-not-reply@notifications.va.gov>" which Thunderbird displays correctly in the preview pane (where I usually read my emails) and if I open the email itself, but the header pane says this email is From "Prepper-co <joshua@prepper-co.com>"

Another example is an email that is actually from "USPS Customer Support <uspscustomersupport@usps.gov>" but the header pane says it is from "Rainier Arms <sales@rainierarms.com" < p></sales@rainierarms.com">

These two examples were received in different email accounts that aren't even on the same server. I have other emails from these same senders that are shown correctly

I found this problem while using 150.0 (64-bit), which said 150.0.1 was available, so I restarted Thunderbird and it updated to 150.0.1 (64-bit) but the problem is the same.

При использовании приложения Thunderbird в качестве почтового приложения возникает следующая проблема: Отправленное письмо не сохраняется в папке Sent, при этом письмо уходит получателю. Также письмо и не появляется (не сохраняется) на сервере. Я использую почту yandex, подключена по протоколу imap в соответствии с требованиями, которые они сами указывают в инструкции (Входящая почта Адрес почтового сервера — imap.yandex.ru. Защита соединения — SSL. Порт — 993. Исходящая почта Адрес почтового сервера — smtp.yandex.ru. Защита соединения — SSL. Порт — 465) Проблема наблюдается сразу у нескольких людей.

I am using Thunderbird on Windows, and I want to hide the yellow “Your privacy is protected” notification bar but still have the privacy protection enabled.

I tried to use a userChrome.css in my Thunderbird profile; here is the path; (C:\User\AppData\Roaming\Thunderbird\Profiles\lz1po89m.default-release\chrome\userChrome.css). I also set toolkit.legacyUserProfileCustomizations.stylesheets to true, but the customization does not work.

If anyone can please help and/or advise me on the correct procedure or CSS selector for this version I would be very much appreciated.

I have a trojan in one of my emails. Every time I start TB McAfee catches the bug. I cannot find it. What processes does TB execute while loading. I want to be able to isolate the the bug. What tools can I use in TB to help with this.

My TB installation got corrupted due to a hardware/disk issue. On restoring it from backup TB keeps trying to download all messages again. I know this is something to do with the popstate.dat file but I can't seem to stop it. What do I need to do?

Also, I had never noticed this before (because I never looked at the TB file system) but TB created multiple folders for the email account.pop.mail.yahoo-1.com up to pop.mail.yaho-4.com. Why does it do this and is there a way to get back to just one file? Is this something to do with TB crashing or what?

Is it using all of these files or just the latest and how do I know? All of these folders have a popstat.dat file and one has multiple following the popstat-1.dat etc.

I've no idea how to recover from this. Any help would be much appreciated.

Thunderbird says "certificate for mail.capsense.com is not valid for that server..." and hangs. Then awakes in 10 minutes.

I've been getting this message for months without problems.

Subject says it all. I installed Thunderbird maybe a month ago, because the web version of Yahoo email changed their interface, again, one too many times for me. I love the customizability of Thunderbird!!

If only I could get a handle on the odd checkbox behavior though ...  :-)