Habeas Warrant Mark

Habeas Sender Warranted Email was an attempt to fight email spam by legal, rather than technical, means. It is apparently defunct.

It used a so-called Habeas Warrant Mark, which was a set of email headers containing a copyrighted haiku, and various trademarks. Non-spam emails were authorized to include the Warrant Mark in their headers, but any spammers who distributed the Warrant Mark could be sued by Habeas for intellectual property infringement. Spam filtering software would hopefully judge an email containing the Warrant Mark as unlikely to be spam.

Format
The first few lines of the Warrant Mark contain the haiku. The remaining lines are reproduced below. ... X-Habeas-SWE-5: Sender Warranted Email (SWE) (tm). The sender of this X-Habeas-SWE-6: email in exchange for a license for this Habeas X-Habeas-SWE-7: warrant mark warrants that this is a Habeas Compliant X-Habeas-SWE-8: Message (HCM) and not spam. Please report use of this X-Habeas-SWE-9: mark in spam to .

Links

 * How Sender Warranted Email works (from archive.org)