Thunderbird Community Forum

Hello Thunderbird Support, I am experiencing a severe IMAP folder synchronization loop with my Yahoo Mail account ([redacted]@yahoo.fr) inside Thunderbird. Yahoo Support claims the issue is caused by Thunderbird's folder mapping, so I am reaching out to you for a solution.

1. 1. The Problem:

The system-protected folder "Bulk" (Spam) has somehow been moved or mapped as a subfolder inside the "Trash" folder.

• In the Yahoo Mail Web UI (Chrome), the subfolder is invisible, but the Trash directory shows an arrow (^) indicating a child folder exists.
• In Thunderbird, the Bulk folder is clearly visible inside the Trash folder, marked with the flame (Junk) icon.

1. 1. What goes wrong:

When I delete spam messages via Thunderbird, they get trapped inside this nested Trash/Bulk directory. If I try to delete or empty it, the emails disappear but the folder itself cannot be removed.

1. 1. Steps tried so far that failed:

1. Attempting to delete or rename the Bulk folder inside Trash gives the server error: [CANNOT] DELETE failed - Mailbox is reserved. 2. Using Shift + Delete on the folder is rejected by the Yahoo server. 3. Unsubscribing from the folder via "Advanced IMAP settings" -> "Show only subscribed folders" fails; Thunderbird re-downloads the structure on the next sync. 4. I have completely deleted my old Thunderbird profile folder and created a brand new one using thunderbird.exe -P. Upon adding the Yahoo account via OAuth2, Thunderbird immediately pulled the same broken Trash/Bulk structure from the server again.

Since Yahoo refuses to help and claims Thunderbird caused this mapping loop, is there a hidden config setting (about:config) or a database override in Thunderbird that can force the server to release or move this reserved folder back to the root directory? Thank you for your assistance.

Hi!

I am using Ubuntu 26.04 with Gnome 50.1 (kernel 7.0.0-28-generic). I installed Thunderbird 1:140.13.0+build1-0ubuntu0.24.04.1~mt1 amd64 from source (140.12.1esr).

When I receive an email, I get a system notification where I have an option to "Mark as read" or "Delete". For most emails, if I click on "Mark as read", the email will be marked as read. However, Thunderbird has the feature to automatically put emails into Junk. And if I click on "Mark as read" for emails that are going to be automatically put into Junk, the emails will remain unread. It would be nice to mark the junk emails as read when I click on the button.

Thanks in advance!

Hi, I'm using Version 140.12.1e (64b). Is there any way to block and delete undesirable E-Mails om my Incoming box ? Even while being marked 'Undesirable', they stil coming again. Is there a way to erase them automatically ? Many thanks, Have a good day, Dan

I have a particular need to periodically run junk mail filters on a folder in Local Folders that I know will contain mostly junk mail. According to a search engine, the command to do filtering on particular folders should come up in a junk mail tab when you right click on a folder and look under properties. When I right click on a folder, however, I never see a junk mail tab under properties or anywhere else. Where to I find the command to do junk mail filtering on a specific folder? Greatly appreciate any assistance.