Respect for Rights of Third Persons

(a) In representing a client, a lawyer shall not use means that have no substantial purpose other than to embarrass or harm a third person or use methods of obtaining evidence that violate the legal rights of such a person. (b) A lawyer who receives a document, electronically stored information, or other writing relating to the representation of the lawyer's client and knows or reasonably should know that it was inadvertently sent shall promptly notify the sender.