mail:
        host: smtp.mail.yahoo.com
        port: 587
        username: xxx
        password: xxx
        protocol: smtp
        properties.mail.smtp:
            auth: true
            starttls.enable: true

@Inject
private JavaMailSenderImpl javaMailSender;
...

MimeMessage mimeMessage = javaMailSender.createMimeMessage();
message.setTo(to);
message.setFrom(fromEmail);
message.setSubject(subject);
message.setText(content, isHtml);
javaMailSender.send(mimeMessage);