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我已经配置了 courier IMAP 服务器并测试了 IDLE 功能，它在使用 telnet 时可以正常工作

  machinexxx:~$ telnet hostname 143
    Trying x.x.x.x...
    Connected to hostname.
    Escape character is '^]'.
    * OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2008 Double Precision, Inc.  See COPYING for distribution information.
    a login loginname password
    a OK LOGIN Ok.
    b select INBOX
    * FLAGS (\Draft \Answered \Flagged \Deleted \Seen \Recent)
    * OK [PERMANENTFLAGS (\* \Draft \Answered \Flagged \Deleted \Seen)] Limited
    * 27 EXISTS
    * 0 RECENT
    * OK [UIDVALIDITY 1358238865] Ok
    * OK [MYRIGHTS "acdilrsw"] ACL
    b OK [READ-WRITE] Ok
    b IDLE
    + entering ENHANCED idle mode
    * 28 EXISTS
    * 1 RECENT

当我从我的 grails 应用程序中尝试相同的操作时，它只是挂在 java mail IMAPFolder idle() 命令上并且没有得到任何更新。知道发生了什么吗？我试图搜索其他问题，看起来没有一个直接的解决方案（他们建议多线程或创建一个线程来调用 idle() 方法，然后重新运行同一个线程）有没有人实现它请分享代码. 谢谢！

  def serviceMethod() {


        log.info("Email Service check for emails!")

        runAsync {   
        Properties props = new Properties()           


        props.setProperty "mail.store.protocol", "imap"
        props.setProperty "mail.imap.host", "hostname"  
        props.setProperty "mail.imap.port", "143"

        def sess = Session.getDefaultInstance props, null      
        def store = sess.getStore "imap"        

        IMAPFolder inbox

        try{


              store.connect("hostname", 143, "loginname", "password") 

              inbox = store.getFolder "INBOX" 

              inbox.open(Folder.READ_WRITE)

              inbox.idle(false)

              def messages = inbox.search(new FlagTerm(new Flags(Flags.Flag.SEEN), false))

              def contents, bodyPart
                messages.each { msg ->

                println("${msg.subject} ${msg.sender}")

              }        
        } 
        catch(MessagingException e){
            log.error "Issue with connecting to email store or accessing folder or messages: " + e
        }
        catch(Exception eX){
            log.error "enable to read email " + eX
        }
        finally {
          if(inbox){
              inbox.close(true)
             }
              store.close()
        }
    }
    }
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