Trouble with Mail mailboxes on IMAP account

Hi,

My host seems to have changed some folders in my IMAP mail accounts.

So, when I'm witing an email, I get this annoying pop-up as soon as Mail wants to save it to Drafts, which i can't click away, as it keeps coming back half a second later.

Only option is to Force Quit mail, re-open mail, close the window of the mail I was writing without saving the draft...before Mail attempts again to save it ti Drafts.

I've contacted my host, who told me to rename may Drafts folder, but Mail won't let me! It just changes is instantly back to INBOX.Drafts

When I it Enter.....tadaaa!

Oh, and now i get

Any help would be much appreciated.

Thanks,

Jonathan