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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