Lookalike sender domain (untrusted sender)

type.inbound
and length(sender.email.domain.sld) > 3
and sender.email.domain.domain not in $org_domains
and any($org_domains,
        // this rule can be duplicated in order to tune the threshold
        strings.ilevenshtein(sender.email.domain.domain, .) == 1
)
and (
  (
    profile.by_sender_email().prevalence in ("new", "outlier")
    and not profile.by_sender_email().solicited
  )
  or (
    profile.by_sender_email().any_messages_malicious_or_spam
    and not profile.by_sender_email().any_messages_benign
  )
)

// 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_email().any_messages_benign