Java SpringBoot读取Microsoft Exchange收件箱遇连接及认证问题

初始问题 #

使用Java SpringBoot读取Microsoft Exchange账户收件箱（已实现邮件发送功能）时，出现连接错误：

javax.mail.MessagingException: Connection dropped by server?

确认用户名和密码无误，初始配置代码如下：

Properties mailProps = new Properties();
mailProps.setProperty("mail.transport.protocol","smtp");
mailProps.setProperty("mail.smtp.auth","true");
mailProps.setProperty("mail.smtp.starttls.enable","true");
mailProps.setProperty("mail.debug","false");      
mailProps.setProperty("mail.smtp.sasl.mechanisms.oauth2.oauthToken", password);
Session session = Session.getDefaultInstance(mailProps);   
Store store = session.getStore("imaps");      
store.connect("outlook.office365.com", 143,  username, password); // 用户名和密码已省略
Folder emailFolder = store.getFolder("inbox");
emailFolder.open(Folder.READ_ONLY);

更新1：参照Thunderbird配置修改后 #

Thunderbird客户端可正常读取该收件箱，参照其配置修改代码后，出现SSL相关错误：

DEBUG: getProvider() returning javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle]
DEBUG IMAPS: mail.imap.fetchsize: 16384
DEBUG IMAPS: mail.imap.ignorebodystructuresize: false
DEBUG IMAPS: mail.imap.statuscachetimeout: 1000
DEBUG IMAPS: mail.imap.appendbuffersize: -1
DEBUG IMAPS: mail.imap.minidletime: 10
DEBUG IMAPS: enable STARTTLS
DEBUG IMAPS: closeFoldersOnStoreFailure
DEBUG IMAPS: trying to connect to host "outlook.office365.com", port 143, isSSL true
javax.mail.MessagingException: Unsupported or unrecognized SSL message
at it.spring.platform.services.communication.mail.MailTest.read(MailTest.java:53)

完整Spring收件箱读取代码：

import javax.mail.MessagingException;
import javax.mail.Store;

public class JavaMailReader
{
 private Store store;
 private String username;
 private String password;
 private String host;
 private int port;
 private String inbox;

 public JavaMailReader(Store store, String host, int port, String username, String password, String inbox)
 { 
   this.host=host;
   this.port=port;
   this.store=store;
   this.username=username;
   this.password=password;
   this.inbox=inbox;
   this.port = port;
  }

  public void connect() throws MessagingException
  {
    store.connect(host, port, username, password);       
  }

  public Store getStore()
  {
   return store;
  }   

  public String getInboxFolderName()
  {
    return this.inbox;
  }    
}

@Bean
public JavaMailReader emailReader(@Value("imaps") String protocol,
                                  @Value("${mailreceiver.mail.host}")  String host,
                                  @Value("${mailreceiver.mail.port}") Integer port,
                                  @Value("${mailreceiver.mail.password}")  String password,
                                  @Value("${mailreceiver.mail.username}") String username) throws NoSuchProviderException, MessagingException
{
  Properties mailProps = new Properties();       
  mailProps.setProperty("mail.transport.protocol","imaps");
  mailProps.setProperty("mail.imaps.auth","true");       
  mailProps.setProperty("mail.debug","true");        
  mailProps.setProperty("mail.imaps.sasl.mechanisms.oauth2.oauthToken", password);       
  Session session = Session.getDefaultInstance(mailProps);   
  Store store = session.getStore(protocol);       
  return new JavaMailReader (store, host, port, username, password, "inbox");
}

// 测试代码
@Test
public void read() throws NoSuchProviderException, MessagingException
{     
  Message[] messages = mailService.getInbox(); // 对应getInbox("Inbox")
  Message found=null;
  for(Message m: messages)
  {
    if(m.getSubject().equalsIgnoreCase(subject))
    {
        found=m;
        break;
    }
  }
  assertNotNull(found);
  mailService.closeReader();
}

更新2：修改端口为993并移除STARTTLS配置后 #

按照建议将端口改为993，移除STARTTLS配置，代码如下：

Properties mailProps = new Properties(); 
mailProps.setProperty("mail.transport.protocol","imaps");
mailProps.setProperty("mail.imaps.auth","true");      
mailProps.setProperty("mail.debug","true"); 
mailProps.setProperty("mail.imaps.sasl.mechanisms.oauth2.oauthToken",  password);
Session session = Session.getDefaultInstance(mailProps);  
Store store = session.getStore(protocol);     
return new JavaMailReader (store, host, port, username, password, "inbox");

现在出现认证失败错误：

DEBUG IMAPS: trying to connect to host "outlook.office365.com", port 993, isSSL true
* OK The Microsoft Exchange IMAP4 service is ready. [ 安全原因已省略字符串==]
A0 CAPABILITY
* CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+
A0 OK CAPABILITY completed.
DEBUG IMAPS: AUTH: PLAIN
DEBUG IMAPS: AUTH: XOAUTH2
DEBUG IMAPS: protocolConnect login, host=outlook.office365.com, 
user= 邮箱地址已省略, password=<non-null>
DEBUG IMAPS: AUTHENTICATE PLAIN command trace suppressed
DEBUG IMAPS: AUTHENTICATE PLAIN command result: A1 NO AUTHENTICATE failed.
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 3.159 s 
javax.mail.AuthenticationFailedException: AUTHENTICATE failed.

内容的提问来源于stack exchange，提问作者Discipulos