Lookalike sender domain (untrusted sender)

type.inbound
and any($org_domains,
        // this rule can be duplicated in order to tune the threshold
        strings.ilevenshtein(sender.email.domain.domain, .) == 1
)

and (
  (
    profile.by_sender().prevalence in ("new", "outlier")
    and not profile.by_sender().solicited
  )
  or (
    profile.by_sender().any_messages_malicious_or_spam
    and not profile.by_sender().any_false_positives
  )
)

// negate highly trusted sender domains unless they fail DMARC authentication
and (
  (
    sender.email.domain.root_domain in $high_trust_sender_root_domains
    and not headers.auth_summary.dmarc.pass
  )
  or sender.email.domain.root_domain not in $high_trust_sender_root_domains
)

and not profile.by_sender().any_false_positives