javax.mail.AuthenticationFailedException 에러를 발생하며 메일발송이 실패 javax.mail.Session의 setDebug(true)로 디버깅 결과 421 4.7.66 TLS 1.0 and 1.1 are not supported. Please upgrade/update your client to support TLS 1.2. Visit https://aka.ms/smtp_auth_tls. We intend to make a final announcement when we are ready to make the change to disable TLS1.0 and TLS1.1 for SMTP AUTH for the regular endpoint. 를 확인할 수 있다. 따라서..
