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AbstractMailSender의 sendMail 메서드에서 MimeMessage를 생성하는 로직이 중복되어 객체로 분리했습니다.
추상 클래스인 AbstractMailSender를 구현하는 구현체는 MailSender, QuestionSender, WeeklyQuestionSender 세 개가 있었고,
각각의 Sender에서 생성하는 MimeMessage가 모두 각각의 이유로 달라질 수 있기 때문에
추상 클래스인 MimeMessageCreator를 상속받도록 했습니다.
AbstractMailSender 클래스는 제네릭 타입으로 Message 타입만 사용하고 있었는데,
MimeMessageCreator를 상속하는 타입을 추가로 가지게 변경됐습니다. 🫠