Folders appearing in IMAP/Mail.app - cannot delete

I've had several odd mailboxes/folders appear in one of my IMAP accounts over the last 6 months or so. They appear only in Mail.app. If I log into the browser-based email client for that account, these mailboxes/folders are not visible. The name of each begins with "nfs" and is followed by various sorts of junk, e.g.:
nfs00000000d809d85c000021bd
nfs00000000d8602f56000010a1
nfsd8bd59e5000075b7
None of the mailboxes have any messages in them. I wouldn't care too much except that they take up a line each on the left-hand pane of Mail.app, pushing mailboxes I want to see down and off-screen.
If I right-click/control-click on one and choose "Delete Folder," I get the following error message:
"The IMAP command 'DELETE' failed with server error: Mailbox does not exist or must be subscribed to.."
I've done a lot of searching online and have found no solutions to this problem. Any thoughts?
Thanks,
EH

Problem may have been on the server. The folders did show up there, where they caused some problems with the browser-based email client, making it impossible for me to manage my folders there. Tech support for my server managed to locate and delete them. Still not sure how/why they appeared in the first place.
I'm going to mark this question as answered, though I still don't know for sure where the problem arose (Mail.app vs. server weirdness).

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Folders appearing in IMAP/Mail.app - cannot delete

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