Thunderbird Community Forum

Today is 01.16.2026 Hi Volunteers, thank you for the service you are providing Thunderbird users.

I didn't see a topic called Security, so I chose Settings.

For Thunderbird version 146, what specific version of LDAP is being used?

Regarding which LDAP version is the most up to date, I found this: https://pkg.go.dev/github.com/go-ldap/ldap/v3@v3.4.12

My concern is about LDAP's security. I believe it is reasonable to think that the latest available version of LDAP would have the latest and most up to date security patches applied.

I would like to feel secure knowing I have the protection of the newest version of LDAP which affords the best security protection available for Thunderbird laptop version 146.

However I have been unsuccessful in determining if Thunderbird 146 is using this LDAP latest version. Could you help me learn if Thunderbird 146 is utilizing the latest version of LDAP that is available? Thanks in advance.

Yes I know I am a bit verbose.

Hi all,

After thoroughly searching this database, I could not locate an answer to the issue I am facing, although there seem to have been several similar cases.

My former university has recently decided to delete alumni email accounts, so I am using Thunderbird for email transferring from university to GMail (added both accounts to Thunderbird and then began copying emails and folders). Transfer is slow, depending on the server capabilities etc., but I am going folder by folder and so far it has been fine. I began the transfers a week ago.

Last night I noticed my Thunderbird inbox for my school is not showing anymore. The profile folder is only showing one file (.msf) for Inbox, instead of what should be, in my understanding, two files.

Thunderbird is still communicating well with the university email server because I made a folder rearrangement on the university webmail service (outlook.com) and it showed on Thunderbird. In addition, all my Inbox emails appear fine on the university webmail service (outlook.com).

Any ideas? This is obviously important and urgent.

Thank you in advance.

I'm using Thunderbird 140.6.0esr (aarch64) on a 2024 14" MacBok Pro running MacOS 15.7.3 (24G419).

I manage fourteen email addresses, with most of the traffic going to one primary account, either by direct addressing or forwarders from others of the addresses. Maybe not the most efficient setup, but it means I don't have to scan 14 different inboxes to find the messages I most need.

I currently use ±89 filters on this primary account to file messages in a LOT of mailserver-based folders, and a few folders on the laptop. ±90% of the traffic gets filed in server-based folders so I can use any device to access message history. (I should probably note that these filters and message-threading don't always play nice together.)

For a long time, one of the message filters I'll call "Filter BS" successfully filed specific messages in "Folder BS," a server-based folder 2 levels below the inbox. Folder BS also has 2 levels of sub-folders within it for annual and monthly filing.

Some time ago, I began to have problems with messages of many kinds (subjects/sources/etc.) going missing. Eventually, I searched and found them in Folder BS. In response, I deleted Filter BS, looked for but didn't find other filters responsible for these unexpected results, and managed incoming BS-related messages manually. But despite Filter BS having been deleted, non-BS-related messages still get "lost," meaning incorrectly filed in Folder BS, which is acting like a rogue black hole, sucking up everything that gets too close. I have not been able to identify any criteria for what turns up in Folder BS beyond "lots of stuff that doesn't in any way belong there."

Speculating that something's "off" with the BS folder's directory in a way that would be nearly impossible to fix, I'm trying to figure out the least inconvenient, least risky way to solve the problem.

Not knowing other ways I might compound the problem by making big moves with the MANY messages archived in the BS folder's 7 annual subfolders and their 12 each subfolders; and not knowing how to back up server-based in-box sub-folders, I'm stuck at an impasse.

How should I proceed?

Thanks in advance for any input.

Purchased new laptop. Used export tool in Thunderbird to external HD. Traded in old laptop. Installed Thunderbird & attempted to import my email profile. Import tool requires zip file, but the only file on my external HD is a .default file. I'm getting new email but none of my old emails. Consulted Best Buy Geek & he determined the import tool didn't work properly because the export was missing required files. We further determined the export backup must not have worked properly.

Hi, I am trying to export a calendar from a Windows 10 PC into a Lubuntu PC. The exported Home.ics file is about 217KB. At stage 4 in the import process (which shows the file name correctly) a message in red says "No importable items found in the file" . In the main area it says "Loading items" but nothing happens. Am I missing something here? Thanks

Hi, The question is in the title. I have imported my Outlook data in this 32-bits version (updated to 140.7) . I would like to keep them in a 64-bits version (147). I didn't find the solution. Thank you for helping me. Michael.

Why are older emails disappearing from the Inbox? It didn't do this when I was using Windows 7SP1. Now I have Windows 11 and it seems the Oct and Nov emails I had have disappeared. Only Dec emails are in the Inbox.

When setting up a new account with a Google team address which does not have @gmail.com in it, it tries to authorize the account by bringing up a box to use Microsoft which cannot find the email address.

Why is going to Microsoft? How can I force it to go to Google?

Some senders for example Tangle go straight to my trash and if I move them to the inbox it immediately moves it back to trash. I do not understand what is blocking this nor how to do anything about it. Some send such as Erick Erickson generally go to inbox, but not always. Sometimes it goes to trash again.

Same Topic slightly different question... when I tell Thunderbird to delete all messages older than one year it does not do it. I do not know how to solve this problem. I do contribute to Thunderbird and thank you very much for any help that you can give. Don

Bonjour, J'ai créé une nouvelle adresse gmail, qui fonctionne depuis le site de google. Quand je souhaite l'inscrire pour l'utiliser via Thunderbird (nouveau compte/adresse mail), tout se passe bien et j'obtiens le message "Configuration trouvée dans la base de données des FAI de Mozilla". Je clique ensuite sur Terminé et j'arrive à une fenêtre "se connecter avec Google" qui affiche ma nouvelle adresse mail. Quand je clique sur "suivant", j'obtiens le message "erreur 400 - le serveur ne peut pas traiter la requête, car son format est incorrect". Pouvez-vous m'aider ? Merci d'avance. Laurent Lapchin

I have a professional email address and a gmail address configured correctly in thunderbird. I also have a number of google calendars configured in lightning using the built-in google calendar support (i.e., I am not using the old google calendar plugin). Until recently, when I received and accepted a calendar invitation sent to my professional email address, thunderbird would ask to which calendar I wanted to save the invite. I would select the calendar I wanted and it would be saved appropriately.

A week ago, I created a new google calendar and added it to thunderbird/lightning using the built-in google calendar support. Now, when I accept a calendar invitation, it automatically goes to the new calendar (which is generally not appropriate) without asking me to choose. Furthermore, I am unable to edit these calendar events to change the calendar they are associated with. I have checked the properties of both the new and old calendars and they look the same.

The only seeming solution I found was to make the new calendar read only and disassociate it from an email address, and then undo both those options. For the time being, this operation seems to have gotten back the option to select which calendar invites are saved to. But I would still like to know if this was the correct solution and better understand how thunderbird chooses to save event invitations.

Window 11 desktop. Just downloaded and installed Thunderbird. Unable to type anything in to Calendar . Can only create event and that is unable to pick a time of the day just ends up at the top

Thunderbird has managed to keep all the message headers however the body of EVERY email is now empty. I had archives of email going back to the 80's and it's all gone. I tried to import backups again but TB throws away the body of the messages.

Note that there are many different email address formats in use from regular TCP/IP, XNS, UUCP, Mainframe 8.8, and others. The headers are there and show the addresses but the content is totally empty for every message.

Before TB gets a hold of them, I can read them so I know the data is there and it is TB that is removing it.

Please help

Hi Thunderbird, At the weekend we accidentally completely deleted some Gmail emails from Apple Mail . These were also deleted from Thunderbird (2 Gmail accounts) on our PC. We recovered the emails, in the process having to change my Google Password. Whilst the deleted emails returned, one Thunderbird Gmail account was not receiving new incoming emails. (one account is) The emails are arriving as normal into Gmail. After various unsuccessful attempts to to connect to the server I deleted the defective Gmail account from Thunderbird, using the Red Button in account settings, hoping to then be able to reinstall it as a new account. When I attempt to reinstall the now "deleted" account I get the yellow "Unable to log in at Server" message. . The password I am using to add the account is the same as the one I use to sign into that account on Gmail (set on Monday), but it does not seem to be working on TB. I tried the trick of not putting in the password when setting up the new account but this did not work either. I am using TB 140.6.0esr Any suggestion please John