Link: Base64 encoded recipient address in URL fragment with hex subdomain

type.inbound
and any(body.links,
        length(.href_url.domain.subdomain) == 40
        and regex.match(.href_url.domain.subdomain, '^[a-f0-9]{40}')
        and any(strings.scan_base64(.href_url.fragment),
                . == recipients.to[0].email.email
        )
)