On 11 Dec 2015, at 16:00, Tom Sommer mail@tomsommer.dk wrote:

namespace inbox { mailbox Spam { special_use = \Spam auto = create autoexpunge = 30d } }

This creates the "Spam" folder in the filesystem on login/logout, even though it shouldn't. If I remove autoexpunge, the folder is not created.

I think this is something that doesn't need to be fixed. The folder will eventually be created anyway. And adding a check to avoid its creation causes an extra stat() syscall for most mailbox formats (only LAYOUT=index avoids that). The extra stat() could even mean extra disk I/O in some cases. So I think it's better to just have it create the folder since that gives slightly better overall performance.