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

#####163邮箱########
spring.mail.host=smtp.163.com
spring.mail.username=xxxxxxx@163.com
#163邮箱授权码
spring.mail.password=*********
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

@RestController
public class HelloController {

    @Autowired
    private JavaMailSender mailSender;
    
     @Value("${spring.mail.username}")
    private String username;

     @RequestMapping("/email")
    public String sendSimpleMail() throws Exception {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(username);
        message.setTo("xxxxxxxx@qq.com");
        message.setSubject("主题：发送邮件");
        message.setText("测试邮件发送成功");
        mailSender.send(message);
        return "success";
    }
}