; (iv) severe or irreparable damage to, or destruction of, the post office when alternate quarters acceptable to the Postal Service for use as a post office are not immediately available in the community; (v) a challenge to the sanctity of the mail; or (vi) a lack of adequate measures to safeguard the post office or its revenues; and (D) the term post office — (i) means a Post Office, as that term is defined in section 241.1 of title 39, Code of Federal Regulations, or any successor regulation; and (ii) includes a post office branch or post office station. (2) Authority The Postal Service may implement an emergency suspension of a post office in accordance with the requirements under paragraphs (3) through (7). (3) Notification If the Postal Service implements an emergency suspension of a post office, the Postal Service shall provide immediate notice of the suspension to— (A) the relevant local, regional, State, and Federal officials, including— (i) each Member of Congress who represents the area in which the affected post office is located; and (ii) the chief executive of each relevant unit of local government; and (B) customers, notification to whom shall include— (i) the effective date of the suspension; (ii) the reason for the suspension; (iii) any alternate service available; (iv) the nearest postal retail facility (as defined in section 3 of the Postal Service Reform Act of 2018 ) and hours of service