; and (E) all such delivery points are converted by September 30, 2023. (3) Notification In carrying out conversions under paragraph (2), the Postal Service shall provide written notice at least 60 days in advance of the implementation date of a change in primary mode of mail delivery to postal customers served by an applicable delivery point. (e) Residential address conversion (1) Identification Not later than 1 year after the date of the enactment of the Postal Service Reform Act of 2017 , each Postal Service district office shall identify the residential delivery points within its service area that are appropriate candidates for conversion from door delivery to centralized delivery, curbside delivery, or sidewalk delivery. (2) Voluntary conversion Not later than October 1, 2018, the Postal Service shall commence a program to convert delivery points identified under paragraph (1) to centralized delivery, curbside delivery, or sidewalk delivery. Such program shall operate as follows: (A) Not later than 3 months after the identification of the delivery points under paragraph (1), the Postal Service shall divide such delivery points into geographically based address units (such as street blocks or other similar reasonably segregable units) not to exceed 50 delivery points per unit. (B) Not later than 6 months after such identification, the Postal Service shall provide written notification to postal patrons served by each identified delivery point containing the following: (i) Notice that the delivery point has been proposed for conversion to a more efficient primary mode of mail delivery to more economically provide universal postal service and improve service. (ii) A description of the new primary mode of delivery proposed by the Postal Service and a visual example of such mode. (iii) A conversion consent form and notice that conversion for residential addresses is on a voluntary basis. (iv) A description of benefits of conversion to the postal patron, including access to secure mail and package delivery, and