1. 引入spring-boot-starter-mail 依赖包

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

2. 在application.yml配置邮箱基本信息 

spring:
  mail:
    host: smtp.exmail.qq.com
    port: 465
    username: xxx@xx.com
    password: xxxx
    protocol: smtp
    properties:
      mail:
        smtp:
         auth: true
         ssl:
          enable: true
          socketFactory:
           class: com.sun.mail.util.MailSSLSocketFactory
           fallback: false

3. 实现代码

@Autowired
 
 JavaMailSender javaMailSender; 
 public void testSend() {
  SimpleMailMessage message = new SimpleMailMessage();
  message.setFrom("XXX@xxx.com"); //发送者邮箱地址  此地址一定要和yml邮箱一致
  message.setTo("xxx@xxx.com"); //收件人邮箱地址
  message.setSubject("测试主题");
  message.setText("测试内容");
  jms.send(message);
 }

注意：

如果代码报：501 mail from address must be same as authorization user 错误  ；引起原因是yml中配置的邮箱地址和代码中message.setFrom(xx@xx.com);不一致导致；