Practical network support for IP traceback
Proceedings of the conference on Applications, Technologies, Architectures, and Protocols for Computer Communication
DMTP: Controlling spam through message delivery differentiation
Computer Networks: The International Journal of Computer and Telecommunications Networking
Spamming botnets: signatures and characteristics
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Inside the spam cartel
IEEE Security and Privacy
Email Spam Filtering: A Systematic Review
Foundations and Trends in Information Retrieval
Spamalytics: an empirical analysis of spam marketing conversion
Proceedings of the 15th ACM conference on Computer and communications security
Evaluation of spam detection and prevention frameworks for email and image spam: a state of art
Proceedings of the 10th International Conference on Information Integration and Web-based Applications & Services
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Over the last decade spam has become a serious problem to email-users all over the world. Most of the daily email-traffic consists of this unwanted spam. There are various methods that have been proposed to fight spam, from IP-based blocking to filtering incoming email-messages. However it seems that it is impossible to overcome this problem as the number of email-messages that are considered spam is increasing. But maybe these techniques target the problem at the wrong side: it is the email-delivery protocol itself that fosters the existence of spam. What once was created to make internet-mail communication as easy and as reliable as possible became abused by modern day spammers. This paper proposes a different approach: instead of accepting all messages unquestioned it introduces a way to empower the receiver by giving him the control to decide if he wants to receive a message or not. By extending SMTP to pull messages instead of receiving them an attempt to stem the flood of spam is made. The pull-based approach works without involvement of the end-users. However this new system does not come without a price: it opens the possibility of a distributed denial of service (DDOS)-attacks against legitimate mail-transfer agents. This vulnerability and possible ways to overcome it are also discussed in this paper.