W. Ma, D. Tran, and D. Sharma, On extendable software architecture for spam email filtering, IAENG International Journal of Computer Science, vol.34, p.1, 2007.

L. Cottereau, A peer-to-peer architecture for collaborative spam filtering, 2002.

W. Yih, R. Mccann, and A. Kocz, Improving spam filtering by detecting gray mail, CEAS 2007 -Fourth Conference on Email and Anti-Spam, 2007.

J. Klensin, Simple mail transfer protocol, RFC, vol.5321, 2008.

S. Kitterman, Sender policy framework (SPF) authentication failure reporting using the abuse reporting format, RFC, vol.6652, 2012.
DOI : 10.17487/rfc6652