bulk transfer with differing capabilities

[Ben Liblit]

I'd like to bulk transfer a folder hierarchy from one IMAP server to 
another.  Many of the folders contain both messages and subfolders.  The 
source IMAP server supports this, obviously, but the destination IMAP 
server does not.

I know about "mailutil transfer", but it doesn't seem usable in this 
context.  It reports an error and halts the first time it tries to put 
messages into a folder that has already been created as a "directory" 
with subfolders.

It seems I need one of two things.  Either I need a modified "mailutil 
transfer" that gracefully adapts to this situation or else I need a 
distinct tool which "homogenizes" folders on the source server first.  I 
imagine something with moves "foo" messages into, say, "foo/general" if 
folder "foo" also has subfolders.

Do any of you already have something for dealing with this situation?
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