连接到IMAP javax.net.ssl.SSLException：无法识别的SSL消息

Question

我试图使用以下程序连接到我公司的IMAP服务器，但我正在获取SSLException。

import javax.mail.*; 
import java.util.Properties; 

/** 
* Created by SDuraisamy on 6/18/2014. 
*/ 
public class Test { 
    public static void main(String[] args) { 
     Properties props = new Properties(); 
     props.setProperty("mail.store.protocol", "imaps"); 
     Session session = Session.getInstance(props, null); 
     Store store = null; 
     try { 
      store = session.getStore(); 
//   store.connect("imap.gmail.com","mygmailaccount@gmail.com","password"); 
      store.connect("exchange_server", "account2", "password"); 
      Folder inbox = store.getFolder("INBOX"); 
     } catch (NoSuchProviderException e) { 
      e.printStackTrace(); 
     } catch (MessagingException e) { 
      e.printStackTrace(); 
     } 
    } 
} 

我得到以下异常

javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection? 
    at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:670) 
    at javax.mail.Service.connect(Service.java:295) 
    at javax.mail.Service.connect(Service.java:176) 
    at Test.main(Test.java:17) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134) 
Caused by: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection? 
    at com.sun.net.ssl.internal.ssl.InputRecord.handleUnknownRecord(InputRecord.java:523) 
    at com.sun.net.ssl.internal.ssl.InputRecord.read(InputRecord.java:355) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:789) 

我怎样才能解决这个问题？ 当我连接到我的gmail帐户（源注释见上文）时，我可以通过我的程序连接和阅读邮件。 交换服务器端需要通过IMAP下载消息的任何设置？我已在Exchange服务器上启用IMAP。

Answer 1

改变

props.setProperty("mail.store.protocol", "imaps"); 

到

props.setProperty("mail.store.protocol", "imap"); 

解决了这个问题