The List-Unsubscribe header record was defined in RFC 2369 in 1998.

The List-Unsubscribe header record is intended to allow universal
access to an unsubscribe function, though its implementation has been
relatively weak. The idea is simple: if the List-Unsubscribe header is
sent with an email it should include a mailto link to allow
unsubscribing by email and an http address to allow redirection to an
unsubscribe page. When the ISP receives the email and recognizes the
header record it should then present an unsubscribe link in its
framework.

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