this patch is old. it was written for vpopmail 5.4.4 but i am keeping it here in case the problem is still there with the newest vpopmail versions. or maybe just for educational purposes, i dont know

if you want to install qmail with vpopmail and bincimap, then you will need to apply this patch against vpopmail source tree to make them work properly together.

This patch will modify vpopmail's way of creating folders structure when you add a new user in such a way that both bincimap and vpopmail will know where to get the mails from to deliver to the client.
The only problem which remains to be solved is that you have to migrate existent mail accounts to the new folder structure. This can be done with a small bash script anywayz, i'll make one available soon