fn signatures(headers: &RawHeaders, trusted_ids: &[String]) -> Vec<Signed>Expand description
The signatures that passed, as the trusted results header records them
(trust::dkim_passes), each with what it covers, read from the
DKIM-Signature header it names (domain, selector, start of the signature).
When several headers match one result (a copy, altered), a header counts as
covered only if all of them cover it: a copy can only take away.