javax.mail.MessagingException: Could not connect to SMTP host: smtp.sinzhe.com, port: 25;

javax.mail.MessagingException: Could not connect to SMTP host: smtp.sinzhe.com, port: 25;
  nested exception is:
  java.net.ConnectException: Connection timed out (Connection timed out)
javax.mail.MessagingException: Could not connect to SMTP host: smtp.sinzhe.com, port: 25;
  nested exception is:
  java.net.ConnectException: Connection timed out (Connection timed out)
  at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282)
  at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
  at javax.mail.Service.connect(Service.java:297)
  at javax.mail.Service.connect(Service.java:156)
  at javax.mail.Service.connect(Service.java:105)
  at javax.mail.Transport.send0(Transport.java:168)
  at javax.mail.Transport.send(Transpor
Caused by: java.net.ConnectException: Connection timed out (Connection timed out)
  at java.net.PlainSocketImpl.socketConnect(Native Method)
  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
  at java.net.Socket.connect(Socket.java:589)
  at java.net.Socket.connect(Socket.java:538)
  at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:232)
  at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
  at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1250)
  ... 88 more

阿里云服务器发送邮件，不能发送成功，在本地测试通过的，一番考究之后，是因为阿里云“为了安全”默认将25端口关闭了，一大堆申请开通25端口的教程，别费劲！你没那么大脸，还是老老实实换个思路吧，比如走其他端口

package cn.com.suntree.cmp.utils;

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;

public class MaliUtils {

    //发送邮箱验证码，to 接收方邮箱号码  code:验证码
    public static boolean sendMail(String to, String code) {

        try {
            Properties props = new Properties();

            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.host", "smtp.sinzhe.com");//自己邮箱对应host
            props.put("mail.transport.protocol", "smtp");
            props.put("mail.debug", "true");
            props.put("mail.smtp.starttls.enable", "true");

            //不用默认的方式，就需要天加如下两行代码
            props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");//ssl方式
            props.put("mail.smtp.socketFactory.port", "465");//发送端口 默认是25
            
            // 访问SMTP服务时需要提供的密码
            props.put("mail.user", "发送方邮箱地址");//[e-mail]
            props.put("mail.password", "发送方邮箱对应密码");
            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    // 用户名、密码
                    String userName = props.getProperty("mail.user");
                    String password = props.getProperty("mail.password");
                    return new PasswordAuthentication(userName, password);
                }
            };


            // 使用环境属性和授权信息，创建邮件会话
            Session mailSession = Session.getInstance(props, authenticator);
            // 创建邮件消息
            MimeMessage message = new MimeMessage(mailSession);
            // 设置发件人
            InternetAddress form = new InternetAddress(
                    props.getProperty("mail.user"));
            message.setFrom(form);

            // 设置收件人
            InternetAddress toMail = new InternetAddress(to);
            message.setRecipient(Message.RecipientType.TO, toMail);


            // 设置邮件标题
            message.setSubject("邮件主题");

            // 设置邮件的内容体
            message.setContent("邮件正文！","text/html;charset=UTF-8");

            // 发送邮件
            Transport.send(message);

        } catch (Exception e) {
            e.printStackTrace();
            System.out.println(e);
            return false;
        }
        return true;
    }

}