I have a folder in my IMAP email called uidvalidity. It shows up in my email client (using IMAP). It is shown in webmail as a folder I can "subscribe" to. I can't delete it or (it seems) do anything with it via my email software. What is it? how did it get there? Can I hide it, get rid of it etc? Any info regarding this weird folder is appreciated - I've googled and searched but can't find anything about uidvalidity folders! I am wondering if it shouldn't be there and there's something messed up with my email (plusnet side).