<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-mail</artifactId>
/dependency>

spring:
  mail:
    username: [email protected]
    password: 邮箱校验码
    host: smtp.qq.com
    properties:
      mail:
        smtp:
          ssl:
            enable: true

package com.shi.snyc;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.test.context.junit4.SpringRunner;

import javax.mail.internet.MimeMessage;
import java.io.File;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SnycApplicationTests {

	@Autowired
	JavaMailSenderImpl mailSender;

	@Test
	public void contextLoads() {
		//简单格式传输邮件
		SimpleMailMessage message = new SimpleMailMessage();
		message.setSubject("设置标题");
		message.setText("设置内容");
		message.setTo("[email protected]");
		message.setFrom("[email protected]");
		mailSender.send(message);
	}

	@Test
	public void test2() throws  Exception{
		//创建一个复杂的消息邮件
		MimeMessage mimeMessage = mailSender.createMimeMessage();
		MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);

		helper.setSubject("设置标题");
		helper.setText("<b style='color:red'>设置内容</b>",true);//使用html
		helper.setTo("[email protected]");
		helper.setFrom("[email protected]");

		helper.addAttachment("1.jpg",new File("C:\\Users\\low\\Desktop\\1.png"));

		mailSender.send(mimeMessage);
	}

}