Exception in thread "main" com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM

mail.smtp.starttls.enable = true

Exception in thread "main" javax.mail.NoSuchProviderException: Invalid protocol: null
 at javax.mail.Session.getProvider(Session.java:449)
 at javax.mail.Session.getTransport(Session.java:667)
 at javax.mail.Session.getTransport(Session.java:648)
 at javax.mail.Session.getTransport(Session.java:634)

Transport transport = session.getTransport("smtp");

package com.zhyea.zytools;

import java.util.Date;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class MailSender {

 private static final String MAIL_SMTP_HOST = "smtp.exmail.qq.com";
 private static final Integer MAIL_SMTP_PORT = 587;
 private static final Boolean MAIL_SMTP_AUTH = true;
 private static final String MAIL_SMTP_USER = "robin@zhyea.com";
 private static final String MAIL_SMTP_PASSWORD = "robinzhyea";

 private static Properties props = new Properties();

 static {
  props.put("mail.smtp.host", MAIL_SMTP_HOST);
  props.put("mail.smtp.auth", MAIL_SMTP_AUTH);
  props.put("mail.smtp.user", MAIL_SMTP_USER);
  props.put("mail.smtp.password", MAIL_SMTP_PASSWORD);
  props.put("mail.smtp.starttls.enable", true);
 }


 /**
  * 发送邮件
  */
 public static void send(String to, String title, String content) {
  try {
   Session session = Session.getInstance(props);//创建邮件会话
   MimeMessage message = new MimeMessage(session);//由邮件会话新建一个消息对象

   message.setFrom(new InternetAddress(MAIL_SMTP_PASSWORD));//设置发件人的地址
   message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));//设置收件人,并设置其接收类型为TO
   //设置信件内容
   //message.setText(mailContent); //发送 纯文本 邮件 TODO
   message.setSubject(title);//设置标题
   message.setContent(content, "text/html;charset=gbk"); //发送HTML邮件，内容样式比较丰富
   message.setSentDate(new Date());//设置发信时间
   message.saveChanges();//存储邮件信息

   //发送邮件
   Transport transport = session.getTransport("smtp");
   transport.connect(MAIL_SMTP_USER, MAIL_SMTP_PASSWORD);
   transport.sendMessage(message, message.getAllRecipients());//发送邮件,其中第二个参数是所有已设好的收件人地址
   transport.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
}
package com.zhyea.zytools;
 
import java.util.Date;
import java.util.Properties;
 
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
 
public class MailSender {
 
 private static final String MAIL_SMTP_HOST = "smtp.exmail.qq.com";
 private static final Integer MAIL_SMTP_PORT = 587;
 private static final Boolean MAIL_SMTP_AUTH = true;
 private static final String MAIL_SMTP_USER = "robin@zhyea.com";
 private static final String MAIL_SMTP_PASSWORD = "robinzhyea";
 
 private static Properties props = new Properties();
 
 static {
  props.put("mail.smtp.host", MAIL_SMTP_HOST);
  props.put("mail.smtp.auth", MAIL_SMTP_AUTH);
  props.put("mail.smtp.user", MAIL_SMTP_USER);
  props.put("mail.smtp.password", MAIL_SMTP_PASSWORD);
  props.put("mail.smtp.starttls.enable", true);
 }
 
 
 /**
  * 发送邮件
  */
 public static void send(String to, String title, String content) {
  try {
   Session session = Session.getInstance(props);//创建邮件会话
   MimeMessage message = new MimeMessage(session);//由邮件会话新建一个消息对象
 
   message.setFrom(new InternetAddress(MAIL_SMTP_PASSWORD));//设置发件人的地址
   message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));//设置收件人,并设置其接收类型为TO
   //设置信件内容
   //message.setText(mailContent); //发送 纯文本 邮件 TODO
   message.setSubject(title);//设置标题
   message.setContent(content, "text/html;charset=gbk"); //发送HTML邮件，内容样式比较丰富
   message.setSentDate(new Date());//设置发信时间
   message.saveChanges();//存储邮件信息
 
   //发送邮件
   Transport transport = session.getTransport("smtp");
   transport.connect(MAIL_SMTP_USER, MAIL_SMTP_PASSWORD);
   transport.sendMessage(message, message.getAllRecipients());//发送邮件,其中第二个参数是所有已设好的收件人地址
   transport.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 
}