Application.yml

 mail:
    host: smtp.gmail.com
    port: 587
    username:
    password:
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true

MailService:

public class EmailServiceImpl implements EmailService {

    @Autowired
    private JavaMailSender mailSender;

    /**
     * Send email.
     *
     * @param to the to
     * @param subject the subject
     * @param text the text
     */
    @Override
    public void sendEmail(String to, String subject, String text) {

        try {
            SimpleMailMessage message = new SimpleMailMessage();
            message.setTo(to);
            message.setSubject(subject);
            message.setText(text);

            mailSender.send(message);
        } catch (MailException e) {
            log.info("Mail Exception {}", e);
        }


    }