Link: Secure SharePoint file share from new or unusual sender

type.inbound
// SharePoint email indicators
and strings.like(body.current_thread.text,
                 "*shared a file with you*",
                 "*shared with you*",
                 "*invited you to access a file*"
)
and strings.icontains(subject.subject, "shared")
// the Sharepoint file has been "Protected"
and any([body.plain.raw, body.current_thread.text],
        strings.icontains(.,
                          "This link only works for the direct recipients of this message"
        )
)
and any(body.links, .href_url.domain.root_domain == "sharepoint.com")

// sender is uncommon
and (
  (
    profile.by_sender().prevalence in ("new", "rare", "outlier")
    and not profile.by_sender().solicited
  )
  // or the reply-to address has never sent an email to the org
  or (
    sender.email.domain.root_domain == "sharepointonline.com"
    and beta.profile.by_reply_to().prevalence == "new"
  )
)