<dependency>

    <groupId>org.springframework.boot</groupId>

    <artifactId>spring-boot-starter-mail</artifactId>

    <version>${spring-boot.version}</version>

    <scope>provided</scope>

</dependency>

spring.mail.host=smtp.qq.com

spring.mail.username=你的qq号码@qq.com

spring.mail.password=qq邮箱开启SMTP提供的授权码（注意：不是你的qq邮箱密码）
#下面一般不用动

spring.mail.default-encoding=${spring.http.encoding.charset}

spring.mail.properties.mail.smtp.connectiontimeout=5000

spring.mail.properties.mail.smtp.timeout=3000

spring.mail.properties.mail.smtp.writetimeout=5000

spring.mail.properties.mail.smtp.auth=true

spring.mail.properties.mail.smtp.starttls.enable=true

spring.mail.properties.mail.smtp.starttls.required=true

@Autowired

                private JavaMailSender mailSender;

                @Value("${spring.mail.username}")

                private String from;

SimpleMailMessage smm = new SimpleMailMessage();

                        smm.setFrom(from);

                        smm.setTo("发送方邮件地址");

                        smm.setSubject("springboot测试邮件");

                        smm.setText("简单文本邮件测试发送！");

                        mailSender.send(smm);