1. Guzella, T.S., Caminhas, W.M.: A review of machine learning approaches to spam filtering. Exp. Syst. Appl. 36(7), 10206–10222 (2009)
2. Cohen, W.W.: Learning rules that classify e-mail. In: AAAI Spring Symposium on Machine Learning in Information Access, 25–27 March 1996. Palo Alto (1996)
3. Harisinghaney, A., Dixit, A., Gupta, S., Arora, A.: Text and image based spam e-mail classification using KNN, Naïve Bayes and reverse DBSCAN algorithm. In: ICROIT 2014—International Conference on Reliability Optimization and Information Technology, 6–8 February 2014. Faridabad, India (2014)
4. Erickson, D., Casado, M., McKeown. N.: The effectiveness of whitelisting: a user-study. In: CEAS 2008-The Fifth Conference on E-mail and Anti-Spam, 21–22 August 2008, Mountain View, California (2008)
5. Levine, J.R.: Experiences with Greylisting. In: CEAS 2005—Second Conference on E-mail and Anti-Spam, 21–22 July 2005. Stanford University (2005)