After checking Rule 4.4(b) of the American Bar Association Model Rules of Professional Conduct — which, like Illinois Rule of Professional Conduct 4.4(b), requires an attorney to promptly notify the sender when the lawyer knows he received documents that were “inadvertently sent” — the attorneys who represented a union pension plan in federal litigation with Harris Davis Rebar concluded they could accept copies of HDR’s emails and internal documents from one of its former executives &mdash …