mailimap_lsub problem

Hi.

I use mailimap_lsub to retrive mail folders from IMAP server like this:

mailimap_lsub(imap, "", "*",&list);  // (the  same way as etpan does)

But in the result list there are folders that can not be connected for 
example:

mail/
mail
mail/sent/
mail/inbox

The folder: mail/ and mail (is the same folder) can not be connected. 
Is  there any way to find out which folder can be connected and which not.

Tnx

BY,
Marko


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