LISA '03 Abstract
Pp. 223-236 of the Proceedings
Distributed Tarpitting: Impeding Spam Across Multiple ServersTim Hunter, Paul Terry, and Alan Judge, eircom.net
This paper describes an Irish ISP's attempts to combat the abuse
of resources caused by unsolicited commercial email. We describe the
extension of a multicast system, used to implement POP-before-SMTP
relaying, to share information about remote mail servers between
multiple mail systems. The information may then be used to tarpit
abusive servers - placing delays between SMTP protocol answers thus
mitigating their impact on our systems. We then examine how effective
this has been, and come up with some ideas for future development.
We also discuss building a policy around this and other measures
we use to combat spam. An ISP is in the business of sending and
receiving mail - this makes slowing or blocking mail a delicate
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