Cost-based Anti-spam Systems
Since spam occurs primarily because it is so cheap to send, a proposed set of solutions require that senders pay some cost in order to send spam, making it prohibitively expensive for spammers.
Read more about Cost-based Anti-spam Systems: Stamps, Proof-of-work Systems, Bonds or Sender-at-risk, Suing Spammers
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“In all systems of theology the devil figures as a male person.... Yes, it is women who keep the church going.”
—Don Marquis (1878–1937)