I am using an IMAP email account on several OS X and iOS devices.
On one single OS X machine I have a greyed-out Drafts folder with some strange subfolders:
This is only happening on this particular machine (El Capitan). On other Macs with the same system I see, as expected:
Is there a way to refresh the IMAP folders?
The subfolders shown by Drafts are not empty: they are a subset of the folders I have on the top level (i.e., Sent Messages).
The option to choose a folder as Drafts is not present: