Thunderbird setup

This is what the default folder hierarchy looks like in a correctly setup Thunderbird instance for your Lightspeed managed mail account:

Note the “special folders” with their distinctive icons nested under the Inbox: Drafts/Sent/Archive/Junk and Trash.

You will also have local folders for Junk/Trash/Outbox. Please do not attempt to delete this minimum set of local and server (imap) folders.