Postbox Won't Show Nested Sub Folders
If you have an IMAP account with deeply nested sub folders and your sub folders do not always appear in Postbox, try changing a hidden pref.
- Open Config Editor.
- Paste pb.imap.experimental_list_command into the "Filter" textbox.
- Double-click on the that row for pb.imap.experimental_list_command to change the value from false to true.
- Restart Postbox.