DNS Resource Record Analysis of URLs in E-Mail Messages for Improving Spam Filtering. - Shuji Suwa; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura (SAINT, 2011)

Spam Mail Discrimination System Based on Behavior of DNS Servers Associated with URLs. - Shuji Suwa; Nariyoshi Yamai; Kiyohiko Okayama; Motonori Nakamura; Keita Kawano; Gada (SAINT, 2012)