type.inbound
and any(filter(attachments, .file_extension == 'pdf'),
any(ml.nlu_classifier(beta.ocr(.).text).topics,
.name == 'Secure Message' and .confidence == 'high'
)
and strings.icontains(beta.ocr(.).text, "Microsoft Purview Message")
)
// negate highly trusted sender domains unless they fail DMARC authentication
and not (
sender.email.domain.root_domain in $high_trust_sender_root_domains
and coalesce(headers.auth_summary.dmarc.pass, false)
)
Playground
Test against your own EMLs or sample data.