Is using two mail accounts, connected to the same IMAP server. in each account you have the normal folders, Inbox, Sent, Drafts etc., but one of the accounts have now created some very strange folders on its own, 5, b1, m7, r9, sent messages, spam, z1.
Anyone seen this before? I cannot remove these, at least I dont know how.
iPad 2 Wi-Fi, iOS 10.3.3