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I have several email accounts of all types (IMAP, POP, etc.) managed by a single Thunderbird instance (v140.3.1esr 64-bit) running on Windows 11 (latest update).

A few weeks ago, I noticed that the 'Trash' folder on one of my IMAP accounts lost the 'Empty Trash' context menu item. Email I deleted still went to the 'Trash' folder, but I needed to delete them manually. 'Trash' folders on other accounts continued to work as expected.

This afternoon, I noticed that the deleted mails were no longer going to the 'Trash' folder. Looking this up online, I found the following old topic from 2023: https://support.mozilla.org/en-US/questions/1420657

However, the link cited within that post (https://support.mozilla.org/en-US/questions/1156586) no longer seems to exist and the details cited there no longer seems to be applicable as the interface and other details provided are no longer representative of the product today.

The elements of the post that seem applicable is a potential corruption of the 'Smart Mailboxes'. If I look at <ProfilePath>/Mail/smart mailboxes, I have several files associated with folders that may or may not be associated with the 'Trash' folder of the email account suffering from this problem. Given the date stamps, I'm not sure what they represent or even if they are involved in the currently running product.

Do note that I have been using this client for more going on 20 years.

Can you please provide updated troubleshooting steps and help me understand how I can map the folders under 'Mail' to the appropriate accounts to be sure I am not disturbing account email that is functioning properly.

Thanks in advance for the help,

AJ

When trying to add my outlook.com email account to Thunderbird 143.0.1, using the instructions at https://support.mozilla.org/en-US/kb/thunderbird-and-exchange, I get an "Exchange auth error." I'm able to add the account manually using imap, but I want to use Exchange so I can access my outlook.com calendar and contact when TB is updated to include them.

I'm trying to add accounts through the hosting provider Strato, but as soon as I add a new email, it asks for my name and email address, and I can only click "Next." Then it searches and searches, and I can't cancel without forcibly closing Thunderbird. How can I change this? Why can't I do it manually? Antivirus and firewall are already disabled... it doesn't help.

new 143.0.01

Hello- I have the drafts being saved locally to a draft account but in the last week, drafts are disappearing rather than being saved. I did change severs over the summer and have had a slew of issues since then, but this is a new issue as of this week. I have multiple email accounts and this is happening on all of them. I am on a mac 140.3.1esr (aarch64). Thanks for any help- this is a debilitating issue.

Hello all!

I use Thunderbird as a local archive for my email. I have two accounts in the application: my home email via my ISP (POP) which I predominately use and my gmail (IMAP) which I don't generally use. There are years of messages in folders and sub-folder under the POP account, but nothing under the IMAP.

I’m up to date with Thunderbird at v140.1.0esr (aarch64) on my iMac with Sequoia 15.8.

On 07/22/2025 I went to download some messages via my ISP POP account and saw that a whole bunch of my email folders no longer had any subfolders and were empty of any messages. Some were also duplicated. Please see the attached image.

I haven’t changed any settings in years, and I do not have any add-ins. One of the nice things about Thunderbird has been its solidity and simplicity.

After every session, I would empty my trash and compact.

Suddenly my email seems to be gone along with sub-folders while top level folders are duplicated.

Wondering if anyone has any suggestions on how to troubleshoot this? Since I don't do anything fancy with the application and with the suddenness of this issue, I can't image I'm the only person having it? I’m quite concerned I may lose many years’ worth of messages.

Thanks much in advance! CPRoot

Hello,

I have Thunderbird version 140.3.1esr (64-bit) , everything looks good with multiple accounts , except there is a big issue on reading emails: 1- when I double click on any email I get the email as edit mode and not like when I press F8. when I press F8 the email looks normal, but when I double click not.

2-Some emails received as HTML format reads the body as HTML attachment. 3-Some emails show part of the email and not all text with HTML format.

Hope the developer know about this issue and someone can help me to solve this issue if work around.

Thank you

How do I add a person's non-default email address to a mailing list?

I have a mailing list for our golf league, and in my address book many of those in the list have both a work and home email address, with one marked as the default. Some of our members would like messages sent to the list to go to both addresses. But I haven't found a way to add a person's non-default address to the list.

Do I need to create two address book entries for each of these people, one for each email address, and separately add them both to the list? That seems awfully klunky/inefficient to me.

I recently noticed that some of my local folders are missing. Not all of them, but some of them. Following some advice we found in the forums, we closed Thunderbird and then deleted the .MSF files from the Local Folder. When we restarted TB, we had more of the local folders, but were still missing 18 of them in the alphabetical order they are listed in. I created a new profile and copied the local folders over to the new profile. When I started TB using the new profile, there were fewer local folder listed than before. Went back to the previous profile and had the local folders that were still missing 18 folders. I see that there maybe a bug for this being researched as I saw 4 other posts in the forums regarding this recent problem and wanted to get my problem noted also. Thank you.