참조 : https://www.journaldev.com/2532/javamail-example-send-mail-in-java-smtp
JavaMail Example - Send Mail in Java using SMTP - JournalDev
JavaMail Example. Send mail in java. Java SMTP, JavaMail SMTP example authentication, TLS, SSL, attachment, images, gmail email example, tips, faqs
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※Gmail은 TLS 사용 권장
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