Function unsubscribe_now 

fn unsubscribe_now(
    list: &List,
    sender: &str,
    account: &str,
    way: &Way,
    shared: &Shared,
) -> String

Leaves a list, its ten seconds gone: posts the one click, or sends the message from account as any message is sent (a copy in Sent, which Gmail files itself). Done, it is kept in the record. Returns what the status line says.