[MailAuthenticationException/500]nested exception is org.springframework.mail.MailAuthenticationException: Authentication failed; nested exception is javax.mail.AuthenticationFailedException

SMTP를 이용한 메일보내기를 구현하던 중 다음과 같은 에러가 발생했다. org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.mail.MailAuthenticationException: Authentication failed; nested exception is javax.mail.AuthenticationFailedException: 534-5.7.14 Please 534-5.7.14 log in via your web browser and then try again. 534-5.7.14 Learn more at d19sm4840195pjz...

2019.10.17