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USENIX 2003 Annual Technical Conference, FREENIX Track — Paper
[USENIX Annual Conference '03 Tech Program Index]
Next: 1 Introduction
ASK: Active Spam KillerMarco Paganini paganini@paganini.net www.paganini.net
Abstract:
We present Active Spam Killer (ASK), a program that attempts to validate
unknown senders before allowing delivery of their message. Validation occurs
by means of a challenge reply sent to senders who are not yet known to the
system. Messages are kept in a queue pending confirmation until the sender
replies to the challenge. Further messages coming from confirmed senders
are delivered immediately. In a sample of 1000 spam mails, ASK was
99.7% effective at blocking spam, resulting in only 3 spam messages being
delivered. Other programs' best ratios were 97.8% or as many as 22 spam
messages delivered.
Marco Paganini 2003-04-07
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