Folder display changes for junk and "sent messages" folders
I believe that version 145.0, newly installed on the 9th December, 2025 was showing server folders correctly; the server folder name matched the client folder name.
After upgrading to 146.0 on the 10th December, the server folder names for some folders are displaying with different client folder names.
The IMAP account has both "spam" and "junk" folders, Thunderbird is now displaying both as "Spam", you can only determine which folder is which by showing folder properties. It appears to users that there are two "Spam" folders now and not the two distinct folders with their own names.
Similar behaviour is happening for "Sent" and "Sent Messages" folders, both now display as "Sent".
These changes are confusing, the client sees two "Spam" folders and two "Sent" folders instead of the original proper server folder names.
Why has the display name for these folders changed?
How can I get TB to display the real underlying folder names?
Vybrané riešenie
You may find it useful to follow this bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=2001557
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@affinity, a reply from developers ...
"All folders with special folder flags get localised names. if there's two folders with the flag, they both get the same name. This change was intentional although this particular side-effect isn't really great"
@Wayne for developers...
Why the hell screw with folder names? At the very least, iconify the "type" of folder, but KEEP the name that the IMAP server is using. The names have obvious distinctions.
Spam and Junk are NOT the same.
"Sent" and "Sent Items" are typically non iDevice names with Apple having to be different and labeling /their/ sent folder as "Sent Messages" .... All are "Sent" folders, but each has their own name with valid reason or not! Email clients should NOT dictate how a folder is displayed in terms of it's name, clearly this is a poor decision to do so. It may be similar to the dumbing down which is done for the Apple world, but it shouldn't be acceptable practice.
How can we adjust this behaviour in config settings, if we cannot, please change that instead of dictating such a poor experience; not even Lookout (otherwise known as Outlook) does anything like this.
Vybrané riešenie
You may find it useful to follow this bug report: https://bugzilla.mozilla.org/show_bug.cgi?id=2001557
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