Hi, can somebody explain what the NOOP is for? My logfile shows [16:13:35] IMAP4< 51 OK Fetch completed. [16:13:35] IMAP4> 52 UID STORE 8640 +FLAGS.SILENT (\Seen) [16:13:35] IMAP4< 52 OK Store completed. [16:15:04] IMAP4> 53 NOOP [16:15:05] IMAP4< 53 OK NOOP completed. [16:15:05] IMAP4> 54 CLOSE Thanks, Frank Elsner