ITSYSTEM Disable VRFY for Postfix wowbelly 2017. 12. 1. 15:53 http://rich-notes.blogspot.kr/2014/09/disable-vrfy-for-postfix-retina-id-146.htmlhttps://linux-audit.com/postfix-hardening-guide-for-security-and-privacy/https://lists.samba.org/archive/linux/2002-October/004814.html 저작자표시 비영리 변경금지 (새창열림)