Deeply nested inboxes

[Hacker Scot]

I've got a friend who started having this issue after switching his  
incoming mail server address from non-secure IMAP to SSL (but still  
the same account on the same server). Not sure whether this list will  
allow attachments, but the picture tells the story.

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Basically, an deeply nested series of inboxes that keeps getting deeper.

At first I thought it was just in the display side in Mail.app but  
those nested folders are also created on the server (he can see them  
in webmail too). No other users on the same server have this issue  
(I'm the server admin). If he deletes the nested folders they re- 
occur.  He's using "INBOX" as his IMAP path prefix since it's a  
courier IMAP server.

I'm having trouble digging up any info about this online. Has anyone  
ever seen similar? Recommended fix? I've already had him rebuild his  
inbox.

Thanks,
Scot