Thunderbird Community Forum

Hi Thunderbird team,

I use Thunderbird on Linux Mint and would like to use it on my iPhone too.

Could you please prioritize the iOS app and share an updated timeline for a public beta or TestFlight access?

My email- [redacted email from public community support forum] @gmail.com

I would be interested in testing an early version and providing feedback.

Thank you,

Guneet

My Thunderbird email is not updating the inbox and it is not delivering any confirmation emails. This makes the account unusable. I have search AI for an hour and none of the instructions provided work; most do not even refer to my account.

Hiya, any re-arranging of the account list does not work. Been like this for months. Checking again today after Thunderbird version update it is still the same.

The drag and drop sort in setting works however the new list order is not applied to the actual account list.

Win11. Thunderbird 154.0 (64-bit).

Any ideas? Searches are pretty much only showing instructions on how to drag and drop. No solutions that I can see. Thanks in advance.

when I open thunderbirdm blank screen comes up with some tabs for emails I had open. there is no pull down menu to access about thunderbird. move the curser anywhere and response is Thumderbird is not responding. How do I fix this or download thunderbird again with out loosing my emails

A couple weeks ago my TB V.159 crashed and I was prompted to create a new profile which I did, but I made the mistake to set the new profile as a POP account. This profile loaded and I found that a few archived subfolders were missing. Also, I'm not able even now to find a "sent" subdirectory that stores my newly sent messages and so I don't know what's happening to them. In other words, my TB V.159 is not usable.

My plan is to delete my current TB software, but before doing that, (in my Windows 11 computer), I'll change my AppData\[redacted]\Roaming\Thunderbird subfolder to AppData\[redacted]\Roaming\OLDTunderbirdOLD. This change will ensure that I don't lose any user profiles in the Thunderbird subdirectory by accident during uninstall and re-install.

I'll then download TB, and I'm inclined to download V.160 if the consensus here is favorable, and then build another user profile set as IMAP because under no circumstances do I ever want TB to delete data on my Network Solutions Internet Host server.

A final question, how do I find the password I'm currently using for TB to download my email from Network Solutions?

Many thanks for the help. Tom

I have run Thunderbird for many years. My PC is Windows 11. A couple of days ago the computer did not boot up. I took it to the Geek Squad. They reported that the OS was corrupted, so they reinstalled the operating system. The computer now boots up, but a casualty is that several applications or other items have to be reinstalled or modified. Many apps worked fine even after the OS reinstallation.

When I tried to run T-bird, I got an error of “Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window.”

I closed Thunderbird and removed T-bird from the task manager and tried to run T-bird again. Same error.

I read that this is because there is a parent.lock file in the appdata\roaming\Thunderbird\profiles folder, and it should be deleted. I closed Thunderbird and removed T-bird from the task manager. I then renamed the parent.lock files as parent.lockold.

I tried running T-bird again, but got the same error.

I uninstalled T-bird. I then reinstalled T-bird.

I tried running T-bird and got the same error. I closed Thunderbird and removed T-bird from the task manager. I then searched for all parent.lock files on my c: drive, and renamed them parent.lockold. I ran T-bird and got to the initial login screen I went through creating a new account and signed out. I then edited the profiles.ini file to use a default profile on the NAS. I ran T-bird and got to the screen asking which profile I wanted to run. I selected the one on the NAS. T-bird opened. It looked OK. I closed it. I then tried to open it again, and got the same error.

I just tried again. I made sure T-bird was not shown as running in task manager. I renamed all parent.lock files as parent.lockold. I get the same message.

There must be some way to get a clear restart of T-bird. How can I absolutely start with a clean slate with T-bird, so that I can reinstall it and then specify using the default profile on the NAS? Is there better solution?

I have the version of T-bird that is downloaded from the website today. Since I can't open T-bird, I can't firm which version it is. I think I recall it was 140.xxxx.

Thanks.

Hallo,

ich bitte um Hilfe, seit dem letzten Update von Thunderbird auf 159.0 (64-Bit) sind meine Mailaccounts verschwunden. Eins konnte ich wieder einrichten, das von T-Online bringt als Fehler ständig "Fehler bei der Authentifizierung" obwohl alles korrekt ist. Thunderbird kann sich automatisch die Serverdaten für IMAP holen, aber sobald ich das Passwort eingebe kommt der Fehler. Das Passwort habe ich jetzt bereits geändert, dennoch funktioniert es nicht. Was kann ich tun?

I was writing a new email and stopped for a while without selecting "save". When I came back, I thought it was something else, useless, and I deleted it by selecting "Discard changes" as well. Is it possible to recover the deleted email?

Strangely, when I navigate to Thunderbird Help and ask my question it brings me to the instruction page which says to follow instructions below. And there are no instructions below!

I am trying to open a new account using [redacted]@gmail.com but I can not get past the host name which I would think is gmail.com

Whenever I attempt to open a .eml file from my hard drive, I receive the "Account Setup" window before the actual file opens. How do I get rid of "Account Setup" as an initial window when opening a file?

This is mostly informational for the community and a question

Background - I was affected by the missing intermittent mail at version 159. After the release of version 160 my problem persisted. Following the fix I set about more troubleshooting. I Had only issues with one of four email accounts tn TB, one other account is to a different server but has the same setup port 993 SSL/TLS setup. My email provider has great support and indicated many had had issues and the reports of 160 correcting the problem were many.

I found an ESET setting was the culprit, in advanced settings under "email client setup" they have a toggle for "Scan IMAPS mail transport" by default this is on. After switching this off version 160 works perfectly. This function has been in place a while and can confirm it worked OK with version 158.

I do not think its the vendor, as in one of my test I loaded the affected account into Windows 11 Outlook and established instant sync with "Scan IMAPS mail transport" on. The problem only effects TB sync with IMAP on one server.

From ESET's information this function scans the mail in route to the client. It does not affect "other" AV function with mail.

The Question: Should I pursue resolving this with TB? Or is it just a conflict?

Please reply to my previous question sent today, November 11, 2026, if you can help.

I'm confident that the e-mail settings were correct, at least according to the settings my Optimum server provided me with. I have a document Optimum sent me with those settings, if you'd like to take a look at them. I also need help with re-establishing my main e-mail account in Thunderbird. At this time I can't add it back to Thunderbird as an e-mail account unless I can connect to the Optimum server via the Thunderbird settings configuration app that I described using in my last e-mail sent this afternoon.

What can I be doing wrong, and what do I need to do to solve my Mozilla Thunderbird e-mail problem?

Since I updated my ISP login passwords one - two weeks ago, as I found myself forced to do to gain access to my ISP user account online, I've been unable to send e-mail from my two original e-mail accounts with suddenlink.net as the domain name, and with the e-mail address being accordeoniste@suddenlink.net. I was able to receive e-mail sent to these accounts from outside parties, which don't include the suddenlink.net domain, just fine,

As my marketing materials include the account accordeoniste@suddenlink.net as my contact e-mail address, I regard it as critical that I solve this problem, so I don't have to use the ISP's webmail service to send, and receive e-mails with this account.

I discussed this problem with specialists from my ISP. They verified that my e-mail and server settings are correct in Thunderbird. When they couldn't help me to solve this problem, one of them recommended that I contact Thunderbird for support, which is why I'm here.

I tried different incoming and outgoing server settings in this Thunderbird "Account Hub" app. I finally resorted to updating Thunderbird from a www update I installed. Nothing worked.

I just ran the add e-mail account and test of server connection again for at least the fifth time, and the test failed to connect to the server yet again. The error message reported is:

"Mozilla Thunderbird failed to find the settings for your email account.

Can’t find a server". Now, in addition to being unable to send e-mail from these accounts, I find myself unable to re-add accordeoniste@suddenlink.net to Thunderbird again, so I can't even receive mail sent to that account in Thunderbird.

I don't know whether this problem is due to an incompatibility between Thunderbird and my ISP. I just know I did what I could to get Thunderbird to work properly again. I need help from a Thunderbird expert, or at least from a skilled Thunderbird practitioner or highly dedicated user.

Please help, if you can.

Hi,

I've started experimenting with Vibecoding some extensions for myself.. But I keep hitting a problem where TB reports back that folders are stale.

Specifically I'll hit something like this:

[Exception... "Component returned failure code: 0x80550005 (NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE) [nsIMsgFolder.messages]" nsresult: "0x80550005 (NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE)" location: "JS frame :: resource:///modules/ExtensionMessages.sys.mjs :: getMessagesInFolder :: line 925" data: no] ExtensionMessages.sys.mjs:928:13 [Exception... "Component returned failure code: 0x80550005

Usually when I go look at these folders in the UI, the total-email-count for the folder in blank, but the Size of the folder will show >1kb (eg .. something greater than zero). If I click on the folder, TB updates the summary file and all is well, for a while.

Some folders do report as no messages, and "blank" for file size as well.. but those seem to be genuinely empty.

These types of issues are causing pain in several extension ideas I've had, and I can't seem to figure out a way to handle them.

For example: I had an idea to create and extension to delete empty folders. The original version would encounter these NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE folders, and then just wipe them out as TB told the extension there were no emails in it. I found this out a little too late for some folders..

Another idea was to create and manage Virtual Search folders automatically. But I've hit a similar issue there with this staleness and had to skip such folders.

I've tried to get the extensions to trigger rebuilding summary files when we hit this error, but that never seems to do the job. The only method I've found is to open the folder manually in TB. Sometimes I'll find that starting a Search across the folders also helps - but that also tends to bail out unexplained.

I'm working with a lot of emails and folders..

If anyone can help explain why TB "forgets" whats in a folder, and how to trigger a summary-rebuild for a specific folder I'd be interested in hearing it.

Thanks

Thunderbird does not display the icons like inbox, sent, etc at startup. I reinstalled the client and everything worked but when I restart it does show the icons or my mail. What setup am I missing?

I have a ton of old *.emls that I want to convert to .txt. I'd use a linux utility if one was recommended. But the 'ImportExportTools NG' addon is supposed to do it, I think, but I can't get it to work, it only offers me to export my profile, not any messages.

Hi,

I imported some contacts from a CSV file into Thunderbird. I'm not trying to copy those contacts over to the GMAIL account I have syncing.

If I create a basic test contact in TB in the sync'd address book, that works just fine and creates over in gmail. But if I try to copy one of the imported contacts over, I get the below error :

NS_ERROR_FAILURE: Sending card to the server failed, response was 400

   _sendCardToServer resource:///modules/CardDAVDirectory.sys.mjs:442

Once copied, that contact shows in the TB gmail address book, as though it's copied it into it. It never seems to retry syncing that contact to gmail though (I don't see it appear, and there's no new errors).

I have an alternative idea to use TB to sort out the contacts and then export back out of TB and try to directly import that into Gmail itself, but I'm not hopeful all the fields line up or that it'll work, and.. it's not as easy as the copy method should be.

Any way I can diagnose more ?

I am attempting to migrate my Win-10 Thunderbird v159.0 to a new Win-11 installation. The current profile folder size is too large for the automatic backup process (6.2 GB), so I am creating a copy of the profile folder structure. When I copy the profile folder structure into the copy buffer, no errors are shown. But, when I attempt to paste into a new folder, I am getting 13 messages regarding the filenames are too long for both sbd and mozmsgs filenames. Is there a maximum local folder name and/or local filenames limit. I can see where I can control the local folder name length, but not the local filename (email) name length.

There are 5 profile folders listed under the Profiles folder, their contents as follows: Profile Name Folder Count File Count Storage k1fx5scw.default 1,211 folders 24,946 files 3.78 GB (appears to be current default) 5zo1yxiu.default-release-1 17 folders 87 files 14.8 MB k1fx5scw.default.old 937 folders 21,555 files 2.29 GB (previous incarnation of default) rpsz3c78.default-release 14 folders 45 files 14.2 MB lhqhc5hj.default 0 folders 1 file 47 bytes