C: A142 SELECT INBOX
  S: * 172 EXISTS
  S: * OK [UIDVALIDITY 3857529045] UIDs valid
  S: * OK [UIDNEXT 4392] Predicted next UID
  S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
  S: * OK [PERMANENTFLAGS (\Deleted \Seen \*)] Limited
  S: A142 OK [READ-WRITE] SELECT completed
  [...some time later...]
  C: A143 SELECT Drafts
  S: * OK [CLOSED] Previous mailbox is now closed
  S: * 5 EXISTS
  S: * OK [UIDVALIDITY 9877410381] UIDs valid
  S: * OK [UIDNEXT 102] Predicted next UID
  S: * LIST () "/" Drafts
  S: * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
  S: * OK [PERMANENTFLAGS (\Deleted \Seen \Answered
      \Flagged \Draft \*)] System flags and keywords allowed
  S: A143 OK [READ-WRITE] SELECT completed