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Recently I have noticed some changes in the way my Thunderbird downloads POP3 messages. Previously, it would be common to ask for new messages once a day and receive upwards of one hundred of them. But in the last month, this number has been limited to about 35 at a time. If I ask immediately again, I get about 35 more, and this pattern continues as long as there are messages in queue waiting to be downloaded. I am not sure if this is due to changes in gmail, where most of my received messages originate, or to changes in Thunderbird itself, or to some sort of third-party hack. Now that I have trained myself to keep on asking until there are no more messages coming down, this change does not cause me much difficulty, although initially it sometimes caused me to overlook messages because I failed to keep asking as long as I should have. Apart from that, it does not seem to be harmful as far as I can tell. I'd just like to know if other people have noticed anything similar, and if anyone knows what is causing it, and whether it has some hidden advantages over the way things used to work.

I installed Thunderbird on a new (used) computer running Windows 11 Pro using the old computer's mail account and password. Thunderbird seemed to connect automatically to the webmail. However, when I click on the email button the program makes me enter my name and password (already entered). Then when I click on next I get - Error Creating Account. What do I do now? Thanks.

Regards,

Dave [edited from public] @centurytel.net

I'm trying to sync Thunderbird Calendar with iCloud. Every time I enter the password generated by iCloud, Thunderbird indicates that the credentials are incorrect. Any suggestions?

bold textA little while ago, all of the messages coming into my Thunderbird app, do not expand graphics etc in the email. I just get strings of code and web stuff.. I cannot find the setting in my Thunderbird that will cause it to automatically translate all of these codes. Help please !

I've been using Thunderbird for over 20 years and I run it on two PC (to have a copy at home and in the office) Running 144.0.1 (32 bit) on Windows 10 and same but 64 bit on the other. The problem is with the 32 bit PC although I don't think this has anything to do with the problem.

Came back to my PC today and my inbox emails are not opening. About 88,000 emails in the inbox can't be accesses but the list of the email info are showing. Click on any one and it's blank.

I have no idea why this has happened, my only ideas are they could be connected with one of the following: 1. A windows restart and update 2. Kaspersky internet security deleting a trojan virus from an email in the inbox and deleting the whole inbox file instead - I have already asked Kaspersky support and they said it would not delete the whole file but I'm not so sure. 3. It might have lost the email when doing a 'compact folder' but I think this is unlikely.

When I closed and restarted Thunderbird any new email coming into the inbox worked perfectly but still the 88,000 previous ones were not visible/readable.

Any help would be appreciated as I'm completely stuck It's strange I only had this problem on the 32 bit version of Thunderbird? Thanks, Brian

I just downloaded Thunderbird to my new computer. It worked fine for a short while. Then it started deleting new emails as soon as they were imported. How can I stop this from happening?

I suddenly this week cannot send email using Thunderbird (v. 140.4.0esr (64-bit)). I receive email fine. I can send email using webmail with my provider. Error message in Thunderbird is: "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-h2p-555359.sys.comcast.net resomta-h2p-555359.sys.comcast.net ESMTP server not available (62240/216.183.125.238)." My provider says the issue is not at their end because my server settings are correct. Outgoing SMTP port is 465, connection security SSL/TLS. Operating Windows 11 v. 24H2.

To be clear, I seriously doubt the problems I am encountering are TB's fault! The problems may be my fault since I've grown older, I've tended (believed) using new versions of software present my mind a BIGGER challenge than using the older software/version I have been successfully using? I'm still using Version115.10.1

After our ISP chose to start using Zimbra Oct. 7, 2025 and their tech support could not assist me in getting TB working the had me remove POP3 settings for TB and change to IMAP with their software.

FINALLY someone helped me get TB working with IMAP. For 3 days grrr. Now the ISP says I need to use their web mail, Zimbra.

So might downloading the current TB version and somehow get the In box, all the folder contnets etc. over - into the new TB help?

I was going to backup everything tonight, now I have little to NO hope, without help!

THANKS & remain WELL plus be SAFE!

Robin

I am trying to export my contacts FROM Thunderbird TO Spectrum email. In Thunderbird, I open my contacts and select my personal address book and click EXPORT. I save the file as vcard to my desktop. I open my Spectrum.net email and click import, select the file and I keep getting an error message saying "we are unable to save your changes, please try again." I contacted Spectrum and they said it was a Thunderbird problem. Can you please help me?

Please consider a slight change in the new feature where on the bottom right we have an opportunity to click on "as read" or "delete". Great time saver, but for heaven's sake you bring up the Thunderbird anyway. Come on ! ! ! ? The short cut is so we don't have to bring it up. What good is this new feature if it is exactly the same number of clicks as if you didn't have this new feature. Walt

How do I get back the choice to get a message brought in manually and other features that were above my account name. I unchecked a box (it was called something board) and it was gone but cant find it to restore the option. I right clicked on that to get a drop down menu with a few choices. I cant remember exactly what they said. One of the icons was for manually bringing in my mail, like a refresh option as well as some other choices beside it. This was visible above my account name which is just above the inbox. Anyone have any idea where I find that again to restore it? One click and it was gone! :-( Hope I explained it good. Thank you

My Tags window & folder [View, Folders, Tags] layout stopped properly displaying all my items with the appropriate "tag" set in the past few updates to T'bird. I recently switched to version 140.4.0esr but the problem existed before that in 140.2.1 as well. Is there any way to force a "rebuild" of the Tags window so that all my tagged items show in their appropriate categories, with appropriate statuses [read/unread, etc]? Otherwise, the Tag feature is no longer useful.

I've been wanting to access Thunderbird's encryption ability on both my laptop and desktop. However, in setting up Tbird on my laptop I notice the user Profile should stay on one computer. Can I use the same Profile on more than one computer using the same source and password? Can I open a new profile on a second computer, even though I would have to use the same email source, a local provider? If not, is there an online source of email data I can use on Tbird on my laptop. Thanks much, Bruce Bartrug

Dear Support, when I forward a message, it gets successfully forwarded to the recipient, but the forwarding message itself is lost -- it's not in the Inbox folder, and not in the Sent folder.

The only indication is a forwarding icon in the forwarded message.

My settings are attached. I'm using IMAP with FastMail. I checked the Web interface and don't see the forwarding message there either.

I also tried selecting the `Sent Items` folder manually in the settings, no difference.

Here's a slightly trimmed `MOZ_LOG="IMAP:5,timestamp"` output https://gist.github.com/igrekster/f694698e4033637f2dd5d6202d99341d

Thanks!

Hey

Thunderbird has a well-functioning Search function that uses the cache (or rather, what the background search process/function "read" and saved in global-messages-db.sqlite).

With a newly configured account (IMAP), it works like this:

- establishes the directory tree - downloads message titles (including sender, date, etc.) - *.msf summary files - then a process that downloads the entire message for local storage - in the background, an indexing process (GLODA?) starts, which creates a search database (subject, from, to, keywords in the message body) using the global-messages-db.sqlite file.

For very large mailboxes (>100k msg, ~50GB), this means that the server's content is transferred to the local disk (and stored in ImapMail).

The question is: how do I configure TB to run in "thin" mode, meaning after connecting a new account: - establish a directory tree - download message titles (including sender, date, etc.) -> *.msf - DO NOT download messages for local storage - start the indexing process, which will download and index the subject, from, to, and keywords in the message body (it will download and "read" the message, but not save it locally) and save it to global-messages-db.sqlite

Setting "mail.server.default.offline_download" to "false" will cause this behavior, but the message body will not be indexed (only from, to, and subject).

I tried to work around this by: - configuring the mailbox with the download option for offline use - waiting for it to download - setting "mail.server.default.offline_download" to "false" - deleting all "cur" directories (I use maildir) or deleting all *.eml files from the ImapMail directory.

Content search works for messages that have been downloaded (and indexed) previously; it doesn't work for new messages.

Why am I trying this? Some people have "air" laptops (meaning - weaker processors, small SSDs) and need access to email (via IMAP), including full search, without having all their email downloaded locally.

In other words, how can I configure TB via IMAP to: - download the directory and subdirectory tree - download the headers of all messages - "read" and index all messages (including their content) and store them in "global-messages-db.sqlite," but not store all messages locally (online mode only)?

Regards Chris

I have several iterations of installing SMIME on my email account. I know the pf12 file is valid and it works on all my Android systems. However, when I try to send a digitally signed email on Thunderbird under Ubuntu, I get the message that either the SMIME certificate cannot be found or it has expired even though I went through the correct process to install it (and it shows up on the End to End Encryption settings) and when I display it, it indicates an expiry date of 2027. I have also tried to bundle it with the intermediate certificate but I still get the same error. I even tried to create my own personal SMIME certificate and use it (using SSL) and it had the same issue. Anyone have any suggestions?

This is the error I get: "Sending of the message failed. You specified that this message should be digitally signed, but the application either failed to find the signing certificate specified in your Mail & Newsgroup Account Settings, or the certificate has expired."

Do I need to put the SMIME certificate in a specific folder in order for it to be "re-found"

Today my Windows 11 pro operating system updated itself to Version 25H2 (OS Build 26200.7171) When I opened Thunderbird it required me to put my account details in and then accessed my IMAP details. All my folders and sub folders were there but no Local Folders. How can I import them into Thunderbird please. Thanks

How can I check if I am supporting Mozilla financially? I just received an email asking for a donation but thought I was already donating. Is there somewhere in my account settings where I can check if/how I am donating?