1、打开邮箱的POP3/SMTP服务，以sina邮箱为例

2、在porm.xml中加入如下依赖，修改properties

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

#MailProperties
spring.mail.host=smtp.sina.com
spring.mail.port=465
spring.mail.username=###
spring.mail.password=###
spring.mail.protocol=smtps
spring.mail.properties.mail.smtp.ssl.enable=true

3、MailClient代码

@Component
public class MailClient {

    private static final Logger logger = LoggerFactory.getLogger(MailClient.class);

    @Autowired
    private JavaMailSender mailSender;

    @Value("${spring.mail.username}")
    private String from;

    public void sendMail(String to,String subject,String content){
        try {
            MimeMessage message=mailSender.createMimeMessage();
            MimeMessageHelper helper=new MimeMessageHelper(message);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content,true);
            mailSender.send(helper.getMimeMessage());
        } catch (MessagingException e) {
            logger.error("发送邮件失败："+e.getMessage());
        }
    }

}

4、发送邮件

private MailClient mailClient;
mailClient.sendMail("xxx@qq.com","TESTMYHERO","HIHIHIHI");

5、HTML邮件

public void testHtmlMail(){
    Context context=new Context();
    context.setVariable("username","sunday");

    String content=templateEngine.process("/mail/demo",context);
    System.out.println(content);
    mailClient.sendMail("xxx@qq.com","HTMLTEST",content);

}

demo.html

<p>欢迎你,<span style="color:red" th:text="${username}"></span></p>

利用spring发送邮件

原文：https://www.cnblogs.com/xuetianyu/p/15070979.html