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My goal is to copy the whole folder structure with all mails from one imap account to another. The tool I am using for this is imapcopy (the java based version from code.google.com since the unix/linux tool packaged with debian doesn't support imaps).

Now, there is one problem: The tool only copies the top-level folders and not the nested ones. To narrow down the problem I have downloaded the source code of imapcopy and debugged into the code. There I noticed that the folder.list() (which is mapped to the list "%" imap command) returns an empty list. But when I do a getFolder(<subfoldername>) I can access those subfolders. After reading some documentation about the features of imap I think that the problem might be some misconfigured ACLs which prohibit the listing of those folders but allow to read ad write to them.

How should I check this ACLs? which tools do I need for this task?

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I found the solution by myself: It seems that calling open() for a particular folder results in an empty list of subfolders for the same folder. By moving the line calling list() before the line calling open(), imapcopy works as expected. I also appended my changed java code to the already existing issue ticket at the imapcopy project.

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