outlook.office365.com IMAP连接超时 我们已经编写了java代码，可以从任何IMAP/POP3邮件服务器提取收件箱电子邮件 对于电子邮件收件箱获取过程，每次重新打开IMAP/POP3邮件服务器连接时（关闭和打开） 此场景持续正常运行，会话连接方法突然抛出“IMAP connect timed out”（IMAP连接超时）错误消息。 阅读javax.mail文档，我们打开了JavaMail API会话调试消息

环境规范： --javax.mail-1.4.3版本。 --JRE-jdk1.8.0_45

我如何理解为什么“outlook.office365.com”邮件服务器突然（这不是网络配置问题，因为我们已经连接）抛出新的超时异常

 2017-05-21 03:09:54,201 [Thread-124]   mailreceiver.LogStream - IMAP DEBUG: IMAPProtocol noop
2017-05-21 03:09:54,201 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,201 [Thread-124]   mailreceiver.LogStream - A7 NOOP

2017-05-21 03:09:54,219 [Thread-124]   mailreceiver.LogStream - A7 OK NOOP completed.

2017-05-21 03:09:54,219 [Thread-124]   mailreceiver.LogStream - A8 CLOSE

2017-05-21 03:09:54,239 [Thread-124]   mailreceiver.LogStream - A8 OK CLOSE completed.

2017-05-21 03:09:54,239 [Thread-124]   mailreceiver.LogStream - DEBUG: added an Authenticated connection -- size: 1
2017-05-21 03:09:54,239 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,239 [Thread-124]   mailreceiver.LogStream - A9 LOGOUT

2017-05-21 03:09:54,260 [Thread-124]   mailreceiver.LogStream - * BYE Microsoft Exchange Server 2016 IMAP4 server signing off.
A9 OK LOGOUT completed.

2017-05-21 03:09:54,260 [Thread-124]   mailreceiver.LogStream - DEBUG: IMAPStore connection dead
2017-05-21 03:09:54,260 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,260 [Thread-124]   mailreceiver.LogStream - DEBUG: IMAPStore cleanup, force false
2017-05-21 03:09:54,260 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,260 [Thread-124]   mailreceiver.LogStream - DEBUG: IMAPStore cleanup done
2017-05-21 03:09:54,260 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - DEBUG: setDebug: JavaMail version 1.4.3
2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc]
2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.fetchsize: 16384
2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.statuscachetimeout: 1000
2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.appendbuffersize: -1
2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.minidletime: 10
2017-05-21 03:09:54,263 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,264 [Thread-124]   mailreceiver.LogStream - DEBUG: trying to connect to host "outlook.office365.com", port 993, isSSL true
2017-05-21 03:09:54,264 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,485 [Thread-124]   mailreceiver.LogStream - * OK The Microsoft Exchange IMAP4 service is ready. [SwBMADEAUABSADAAMgBDAEEAMAAwADAAMQAuAGEAcABjAHAAcgBkADAAMgAuAHAAcgBvAGQALgBvAHUAdABsAG8AbwBrAC4AYwBvAG0A]

2017-05-21 03:09:54,486 [Thread-124]   mailreceiver.LogStream - A0 CAPABILITY

2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - * CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS MOVE ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+
A0 OK CAPABILITY completed.

2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - IMAP DEBUG: AUTH: PLAIN
2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - IMAP DEBUG: AUTH: XOAUTH2
2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - DEBUG: protocolConnect login, host=outlook.office365.com, user=dlpadmin.sg@sembcorp.com, password=<non-null>
2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,498 [Thread-124]   mailreceiver.LogStream - A1 AUTHENTICATE PLAIN

2017-05-21 03:09:54,510 [Thread-124]   mailreceiver.LogStream - + 

2017-05-21 03:09:54,510 [Thread-124]   mailreceiver.LogStream - ZGxwYWRtaW4uc2dAc2VtYmNvcnAuY29tAGRscGFkbWluLnNnQHNlbWJjb3JwLmNvbQBTZW1iQzBycCEh

2017-05-21 03:09:54,756 [Thread-124]   mailreceiver.LogStream - A1 OK AUTHENTICATE completed.

2017-05-21 03:09:54,756 [Thread-124]   mailreceiver.LogStream - A2 CAPABILITY

2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - * CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS MOVE ID UNSELECT CLIENTACCESSRULES CLIENTNETWORKPRESENCELOCATION BACKENDAUTHENTICATE CHILDREN IDLE NAMESPACE LITERAL+
A2 OK CAPABILITY completed.

2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - IMAP DEBUG: AUTH: PLAIN
2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - IMAP DEBUG: AUTH: XOAUTH2
2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - DEBUG: connection available -- size: 1
2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,781 [Thread-124]   mailreceiver.LogStream - A3 SELECT INBOX

2017-05-21 03:09:54,846 [Thread-124]   mailreceiver.LogStream - * 0 EXISTS
* 0 RECENT
* FLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)
* OK [PERMANENTFLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)] Permanent flags
* OK [UIDVALIDITY 14] UIDVALIDITY value
* OK [UIDNEXT 2813] The next unique identifier value
A3 OK [READ-WRITE] SELECT completed.

2017-05-21 03:09:54,846 [Thread-124]   mailreceiver.LogStream - A4 SEARCH UNSEEN ALL

2017-05-21 03:09:54,865 [Thread-124]   mailreceiver.LogStream - * SEARCH
A4 OK SEARCH completed.

2017-05-21 03:09:54,865 [Thread-124]   mailreceiver.LogStream - A5 CLOSE

2017-05-21 03:09:54,885 [Thread-124]   mailreceiver.LogStream - A5 OK CLOSE completed.

2017-05-21 03:09:54,885 [Thread-124]   mailreceiver.LogStream - DEBUG: added an Authenticated connection -- size: 1
2017-05-21 03:09:54,885 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,885 [Thread-124]   mailreceiver.LogStream - DEBUG: connection available -- size: 1
2017-05-21 03:09:54,885 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:09:54,885 [Thread-124]   mailreceiver.LogStream - A6 SELECT INBOX

2017-05-21 03:09:54,916 [Thread-124]   mailreceiver.LogStream - * 0 EXISTS
* 0 RECENT
* FLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)
* OK [PERMANENTFLAGS (\Seen \Answered \Flagged \Deleted \Draft $MDNSent)] Permanent flags
* OK [UIDVALIDITY 14] UIDVALIDITY value
* OK [UIDNEXT 2813] The next unique identifier value
A6 OK [READ-WRITE] SELECT completed.

2017-05-21 03:10:04,916 [Thread-124]   mailreceiver.LogStream - IMAP DEBUG: IMAPProtocol noop
2017-05-21 03:10:04,916 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,916 [Thread-124]   mailreceiver.LogStream - A7 NOOP

2017-05-21 03:10:04,935 [Thread-124]   mailreceiver.LogStream - A7 OK NOOP completed.

2017-05-21 03:10:04,935 [Thread-124]   mailreceiver.LogStream - A8 CLOSE

2017-05-21 03:10:04,955 [Thread-124]   mailreceiver.LogStream - A8 OK CLOSE completed.

2017-05-21 03:10:04,955 [Thread-124]   mailreceiver.LogStream - DEBUG: added an Authenticated connection -- size: 1
2017-05-21 03:10:04,955 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,955 [Thread-124]   mailreceiver.LogStream - A9 LOGOUT

2017-05-21 03:10:04,974 [Thread-124]   mailreceiver.LogStream - * BYE Microsoft Exchange Server 2016 IMAP4 server signing off.
A9 OK LOGOUT completed.

2017-05-21 03:10:04,974 [Thread-124]   mailreceiver.LogStream - DEBUG: IMAPStore connection dead
2017-05-21 03:10:04,974 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,975 [Thread-124]   mailreceiver.LogStream - DEBUG: IMAPStore cleanup, force false
2017-05-21 03:10:04,975 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,975 [Thread-124]   mailreceiver.LogStream - DEBUG: IMAPStore cleanup done
2017-05-21 03:10:04,975 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - DEBUG: setDebug: JavaMail version 1.4.3
2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc]
2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.fetchsize: 16384
2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.statuscachetimeout: 1000
2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.appendbuffersize: -1
2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.minidletime: 10
2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - DEBUG: trying to connect to host "outlook.office365.com", port 993, isSSL true
2017-05-21 03:10:04,978 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:24,997 [Thread-124] WARN  com.pa.fw.common.mailreceiver.IMAPMailProxy - Exception while trying to connect to IMAP connect timed out
2017-05-21 03:10:24,998 [Thread-124] ERROR com.pa.fw.common.mailreceiver.BaseEmailInboxProxy - Fetch new email has been failed:connect timed out[Ljava.lang.StackTraceElement;@c79a1c
2017-05-21 03:10:24,998 [Thread-124]   mailreceiver.EmailFetcher - Failed to process email message: This operation is not allowed on a closed folder : [Ljava.lang.StackTraceElement;@9129dc1
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - DEBUG: setDebug: JavaMail version 1.4.3
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Sun Microsystems, Inc]
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.fetchsize: 16384
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.statuscachetimeout: 1000
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.appendbuffersize: -1
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - DEBUG: mail.imap.minidletime: 10
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - DEBUG: trying to connect to host "outlook.office365.com", port 993, isSSL true
2017-05-21 03:10:35,002 [Thread-124]   mailreceiver.LogStream - 

2017-05-21 03:10:55,014 [Thread-124] WARN  com.pa.fw.common.mailreceiver.IMAPMailProxy - Exception while trying to connect to IMAP connect timed out
2017-05-21 03:10:55,015 [Thread-124]   mailreceiver.IMAPMailProxy - Failed to connect to email server: connect timed out currently there is no connection
2017-05-21 03:10:55,015 [Thread-124]   mailreceiver.EmailFetcher - Failed to process email message: This operation is not allowed on a closed folder : [Ljava.lang.StackTraceElement;@6d810319]

2017-05-21 03:09:54201[Thread-124]mailreceiver.LogStream-IMAP调试：IMAPProtocol noop
2017-05-21 03:09:54201[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54201[Thread-124]mailreceiver.LogStream-A7 NOOP
2017-05-21 03:09:54219[Thread-124]mailreceiver.LogStream-A7正常无操作完成。
2017-05-21 03:09:54219[Thread-124]mailreceiver.LogStream-A8关闭
2017-05-21 03:09:54239[Thread-124]mailreceiver.LogStream-A8正常关闭完成。
2017-05-21 03:09:54239[Thread-124]mailreceiver.LogStream-调试：添加了经过身份验证的连接--大小：1
2017-05-21 03:09:54239[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54239[Thread-124]mailreceiver.LogStream-A9注销
2017-05-21 03:09:54260[Thread-124]mailreceiver.LogStream-*再见Microsoft Exchange Server 2016 IMAP4服务器注销。
A9正常注销完成。
2017-05-21 03:09:54260[Thread-124]mailreceiver.LogStream-调试：IMAPStore连接已断开
2017-05-21 03:09:54260[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54260[Thread-124]mailreceiver.LogStream-调试：IMAPStore清理，强制false
2017-05-21 03:09:54260[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54260[Thread-124]mailreceiver.LogStream-调试：IMAPStore清理完成
2017-05-21 03:09:54260[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-调试：setDebug:JavaMail版本1.4.3
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-调试：getProvider（）返回javax.mail.Provider[STORE，imaps，com.sun.mail.imap.IMAPSSLStore，sun Microsystems，Inc]
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-调试：mail.imap.fetchsize:16384
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-调试：mail.imap.statuscachetimeout:1000
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-调试：mail.imap.appendbuffersize:-1
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-调试：mail.imap.minidletime:10
2017-05-21 03:09:54263[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54264[Thread-124]mailreceiver.LogStream-调试：尝试连接到主机“outlook.office365.com”，端口993，isSSL true
2017-05-21 03:09:54264[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54485[Thread-124]mailreceiver.LogStream-*好，Microsoft Exchange IMAP4服务已就绪。[SWBMadeauabsadaamgbdaeamaawadaamqauageacabjahaacgbkadaamgauaacgbvagqalgbvahuadabag8abwbrac4aywbvag0a]
2017-05-21 03:09:54486[Thread-124]mailreceiver.LogStream-A0功能
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-*功能IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS移动ID取消选择子空闲命名空间文字+
A0正常能力完成。
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-IMAP调试：验证：普通
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-IMAP调试：AUTH:XOAUTH2
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-调试：protocolConnect登录，主机=outlook.office365.com，用户=dlpadmin。sg@sembcorp.com，密码=
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54498[Thread-124]mailreceiver.LogStream-A1
2017-05-21 03:09:54510[Thread-124]mailreceiver.LogStream-+
2017-05-21 03:09:54510[Thread-124]mailreceiver.LogStream-ZGxWYWRTAW4UC2DAC2VTYMNVCNAUY29标记CGFKBWLUNNQHNLBWJJB3JWLMNVBQBTZW1IQZBYCCEH
2017-05-21 03:09:54756[Thread-124]mailreceiver.LogStream-A1 OK身份验证已完成。
2017-05-21 03:09:54756[Thread-124]mailreceiver.LogStream-A2功能
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-*功能IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=xOAuth=XOAUTH2 SASL-IR UIDPLUS移动ID取消选择CLIENTACCESSRULES ClientNetworkPresence位置后端验证子代空闲命名空间文字+
A2正常能力完成。
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-IMAP调试：验证：普通
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-IMAP调试：AUTH:XOAUTH2
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-调试：连接可用-大小：1
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-
2017-05-21 03:09:54781[Thread-124]mailreceiver.LogStream-A3选择收件箱
2017-05-21 03:09:54846[Thread-124]mailreceiver.LogStream-*0存在
*0最近
*标志（\Seen\responsed\Flagged\Deleted\Draft$MDNSent）
*确定[PERMANENTFLAGS（\Seen\responsed\F