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${MAIL_PASSWORD}환경 변수의 기본값:을 제거하면, 로컬 개발 환경 등에서 해당 환경 변수가 설정되어 있지 않을 때 애플리케이션 기동 시Could not resolve placeholder예외가 발생하여 애플리케이션이 실행되지 않습니다. 이메일 발송 기능이 필수가 아닌 로컬 환경에서도 애플리케이션이 정상적으로 실행될 수 있도록 빈 문자열(:)이라도 기본값으로 제공하는 것을 권장합니다.