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昨天在程序中實現IMAP收件的時候發現好多服務器都收不了，用Ethereal對OE進行監視發現其中在Fetch命令前有idle命令，網上查資料發現：
在rfc2177中補充了裡面的關於IDLE命令http://www.faqs.org/rfcs/rfc2177.Html
Example:    C: A001 SELECT INBOX
               S: * FLAGS (Deleted Seen)
               S: * 3 EXISTS
               S: * 0 RECENT
               S: * OK [UIDVALIDITY 1]
               S: A001 OK SELECT completed
               C: A002 IDLE
               S: + idling
               ...time passes; new mail arrives...
               S: * 4 EXISTS
               C: DONE
               S: A002 OK IDLE terminated
               ...another clIEnt expunges message 2 now...
               C: A003 FETCH 4 ALL
               S: * 4 FETCH (...)
               S: A003 OK FETCH completed
               C: A004 IDLE
               S: * 2 EXPUNGE
               S: * 3 EXISTS
               S: + idling
               ...time passes; another clIEnt expunges message 3...
               S: * 3 EXPUNGE
               S: * 2 EXISTS
               ...time passes; new mail arrives...
               S: * 3 EXISTS
               C: DONE
               S: A004 OK IDLE terminated
               C: A005 FETCH 3 ALL
               S: * 3 FETCH (...)
               S: A005 OK FETCH completed
               C: A006 IDLE