No spam notices

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Anti-spam technique: No spam notices
Date of first use: 1998
Effectiveness: Low
Popularity: Low
Difficulty of implementation: Low
Where implemented: MTA
Harm: Low

No spam notices are analogous to the "no junk mail" notices that people can put on their physical mailboxes in some countries. In 1998 CAUCE floated a proposal for a NO UCE tag in the SMTP banner, which was later adapted by Carl Malamud into [RFC 3865] in 2004.

Notices would only be effective to the extent that mailers follow them, and the only possible motivation to follow them would be national laws requiring mailers to do so. Spammers wouldn't of course, but sending spam to a recipient with a banner would be prima facie evidence of breaking the law.