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Background- We’ve been using Thunderbird on a Windows machine for around 15 years (Win 11 for the last 3-4 years). Me and my wife use the same app. We each have an IMAP account for online mail. Also we each have a separate POP3 local folder for our older ‘saved’ emails. Thunderbird is just pointed towards one POP3 local folder at a time. So our accounts are: IMAP mail address A, IMAP mail address B, Pop3 account A or B.

If I want to look at my ‘saved’ emails I just swap Thunderbird account settings so it points towards my local POP3 folder. Normally Thunderbird local folders are directed to my wife’s POP3 folder. Windows explorer says her local folder contains 1,875 Files and 256 subfolders. It uses around 19 Gb of disk space, and the largest subfolder is almost 4GB (it’s a *.sbd folder). She likes to keep all her old emails!.

The problem is:

In recent years Thunderbird seems to automatically create copies of a subfolder that she created called ‘Gen’. (short for 'General'). See image.

These auto-created subfolders are called Gen1, Gen2, Gen 3 etc. They go up to Gen 6.

Some of the emails in these auto-created folders appear to have subject headings that she recognises, but they might have no content or junk content. More often the mails appear to be exact duplicates of other mails, but they are probably not exact duplicates. The ‘remove duplicates’ add-on does not recognise them as duplicates, so we are left with many copies of mails that look exactly the same to us, but are subtly different.

We have tried to delete the unwanted additional emails from these ‘gen’ subfolders, but this generally doesn’t work. Sometimes it just appears to result in another ‘gen’ subfolder being created. It's a bit like 'Whack a mole'!

We have a suspicion that the ‘Compacting’ process may sometimes result in more ‘gen’ subfolders being created.

My wife has many other subfolders in her POP3 directory but they mostly work fine. It’s mainly the ‘Gen’ subfolder that creates problems, though 1-2 other subfolders hint at a similar issue.

When I switch the Thunderbird local folders to look at my POP3 folder I have no problems at all. My POP3 folder is much smaller than my wife’s. (3 Gbyte, 1,297 Files, 174 Folders)

We’re running Thunderbird 128.6.0esr (64-bit), but the problem occurred with previous versions of the programme (over a period of several years). We only have two add-ons. ‘Remove Duplicates’ and ‘import export tools NG'.

Can anyone suggest how we stop the auto-creation of these subfolders? Many thanks in anticipation!

I used to be able to see a running account of the number of messages left to move or to delete.

If this is still available, how do I turn it on?

Thanks.

"Message In Conversation" has disappeared from my emails , so I can't see the thread I right click & only get the top 2 options BUT not the essential , messages prior so I can remember whats gone on & proofs I've sent etc

On 1 of our 2 computers here , ( top image what I have ... Bottom what my wife had & what had until several agonising months ago )

Any help/ solutions be very appreciated Craig , New Zealand

Problem: I installed thunderbird and added my employer's account. I used IMAP and ideally Exchange should be used. The problem is that I only have one folder. I have inbox, but I have no other folders.

Bug: From what I understand, this issue is known.

Question: Does anyone have any idea what time horizon it will take to use Exchange with Thunderbird?

I have an issue with folder hierarchy on all my accounts within my own web server, as shown in image #1 (_ACTUAL.png).

I have checked with the SyOps of my server and they have assured me that there is no special settings or hierarchy of the folder structure, which is corroborated by image #2 (_WEBMAIL.png).

How can I correct this because, because as it stands, it just doesn't make sense; how can you have your Sent messages in your INBOX?

I have unsubscribed and resubscribed (I'm using IMAP BTW) to the folders and the folder list for subscription is incorrect too (see image #3, _SUBSCRIBE.png).

Has anyone had a similar issue and, if so, were you able to fix it?

If any of the TB Guru's out there have any insights into this, please feel free to share.

Thanks, as always.

adelphiaUK (Chris) Please excuse misspellings and anything that may not make sense or cause offence as the medication I take can have an adverse effect on my mind.

duplicate of /questions/1555996 thread

Just purchased and set up Thunderbird on new Samsung Galaxy S25 phone. Message inbox works but Sent, trash, and no other message box displays. How to correct and set up. Also how do you sync android Thunderbird phone app. w computer Thunderbird program. When I delete an inbox message on phone it is not deleted on computer Thunderbird program and vice versa . Computer is new build running Windows 11. Thanks for assistance. Techs at Verizon were unable to help.

For many years, I have used Thunderbird and have made a signature in HTML, with clear pathways to loctions where images are stored. Never had a problem. Here is my successful code:

🧡Mark Robbins🧡
ALLTEXASMEDIA
alltexasmedia@gmail.com
Award-Winning Social Media Marketing Services, Website Design, Logo and Brochure Design, Video Recording and Editing, AI-Based SEO to Attract Customers Daily

https://link.v1ce.co.uk/aaa3x6/611733

duplicate of /questions/1555754 thread

My 'sent mail' has suddenly all disappeared - although still on the mail file server. Inbox mail is fine - but if I send a test message to myself, I get the reply, but the sent message is not saveb. I have uninstalled and reinstalled Thunderbird twice, n - the second time deleting the Mozilla folder under C:\users and then rebooting This happened whilst I was using Thunderbird. I have used Thunderbird for years without problems I have run a virus scan with Malwarebytes, but no problmes showed up. All folders are still vixible on my iPhone

I am about to try reinstalling again. I don't want to have to change email clients.

Any help much appreciated.. Thank you Joan Kemp

Since the last update to version 146.00, under the folder Archives, both the sub folders for 2024 and 2025 have changed to Drafts and I cannot change them back to show the year folder (2024 & 2025). None of my other yearly Archived sub-folders are affected from 2016 - 2023.

Under Properties, both show their respective year correctly - i.e. imap://xxxxxx1%40sky.com@imap.mail.yahoo.com/Archive/2024 and; imap://xxxxxx1%40sky.com@imap.mail.yahoo.com/Archive/2025

I attach screenshots showing the issue and any help would be appreciated.

In essence, after trying various ways of trying to sort the above out, it would be helpfull Mozilla if under the Folder Properties box, I could just change the name back from Drafts to the appropriate year. However, in the folder box when selecting the Name line, it won't allow you to alter the folder name. This would seem the simple solution to any alteration of Folders by being allowed to rename them back to the original name.

(PII removed by moderator)

I had two emails on my Thunderbird. I deleted one by mistake. The G Mail account still works. I tried to reenter my Spectrum Account and I keep getting that my configuration user name or password are wrong. I checked all settings and they appear to be correct. I also deleted the account and tried reinstalling it and got the same result. I also tried to enter a new email account that I just got. I had the same result. Keeps asking me to reenter the password. (would be helpful if it would say why it is wrong (password, setting, etc.) I spent hours on this today. I worked with the Spectrum agent and we couldn't fix it. Bur it seems to be a general problem because I get the same result with both accounts.

I have several folders defined under 'Local Folders'. Two ('Mark_emails' and 'Mums_emails') have been renamed as 'Sent'..... so I now have 3 'Sent' folders! Looking at the properties of one of these, shows:

       Name:  Sent
       Location: mailbox://nobody@LocalFolders/Mark_emails

I can't change the name back to 'Mark_emails'. I've tried Repair, to no avail. I can't delete it either.

It's a similar situation with 'Mums_emails'

I want to keep the emails that these folders contain.

I'm using Thunderbird 146.0 (64-bit) on Windows 11.

It seems as thought the Thunderbird "Archive" folder is actually reflecting my Gmail "All Mail" folder (which includes mail w/o regard to labels). However, is the Archive folder duplicating these emails on my PC, i.e. is there a copy of each Inbox email, etc? This would double the size it takes up on my PC. Or is it simply acting like the "All Mail" folder online - reflecting all emails.

duplicate of /questions/1554841 thread

i get from tthunderbird " the certificate for imap.supanet.com is not from a trusted source " but can i overide this as i do trust the source please reply on [edited from public forum] 6@supanet.com

I was cleaning up my Inbox when I looked at the "Important" folder. I read in a number of places that this is a "Gmail" thing, and messages get in this folder apart from any action etc on my part.

I have a couple questions.

FIRST, are the emails in the "Important" folder only in that folder or are copies in there? I deleted a number of 2 to 3 year old emails that I do not consider important today. The closer I get to this year [2025], the more careful I get.

SECOND, how can the auto-population of that folder be stopped and the folder be deleted? I keep my important emails in designated folders so I can find them.

Thanks in advance

Hi, I can not leave my emails on my email server because I keep corrupting the database because I have to many emails and then I'm unable to check emails. Before I donate and delete my emails off my email server, please confirm this will not delete my emails that I have downloaded to Thunderbird. Thank you in advance, Rose.

After a major windows upgrade crash on a brand new laptop turned in into a brick, Thunderbird was installed at the time and all of my email accounts were working fine. I contacted PCs support team and they agreed to replace it with a new one. All Windows and other relevant updates were done before anything else. Then I started the process of installing the program's that I wanted to use. When I came Thunderbird it installed okay, I added 2 of my email accounts and they work fine. Then I tried to add my Gmail account got through adding server settings then I am asked log in to my Google account where upon I am met with a pop up window with a broken robot an error code 400 and message This should not be repeated, Am I doing something wrong or is there a glitch with Thunderbird. Any help would be greatly appreciated. Brian