C: 07 UID STORE 18000:20000 +FLAGS (\Seen)
  S: * 11215 FETCH (FLAGS (\Seen \Deleted) UID 20000)
  S: * 11214 FETCH (FLAGS (\Seen \Answered \Deleted) UID 19998)
  ...
  S: * 10216 FETCH (FLAGS (\Seen) UID 19578)
  S: 07 OK [MESSAGELIMIT 1000 19578] STORE completed for the last 
      1000 messages