Function who_of 

fn who_of(
    sender: &Sender,
    senders: &Senders,
    always: &People,
    config: &Config,
) -> (Option<Who>, bool)

Who wrote, as your address books and lists say (porch::Senders): none when nobody knows a name; and whether the Always through list holds them (by a number or an address, never a name, which anyone can take).