References

• Web page: www.ziplink.net/~rhaskins

• FWTK: www.tis.com/research/software

• Blackmail: bitgate.com/spam

• Juniper/smtpd: www.obtuse.com/smtpd.html

• Brightmail: www.brightlight.com/isp/spam

• MAPS: mail-abuse.org

• Hash cash: //www.cypherspace.org/~adam/hashcash/

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