; and (B) make recommendations regarding resources needed to procure or build a new facility or augment existing facilities to ensure sufficient size and accommodations to fully support current and projected mission requirements, including the integration of personnel from the private sector and other Federal departments and agencies. (3) Submission of review Not later than 30 days after receipt of the assessment in accordance with paragraph (1), the Administrator of the General Services Administration shall submit to the President, the Secretary of Homeland Security, the Committee on Homeland Security and Governmental Affairs of the Senate, and the Committee on Homeland Security of the House of Representatives the review required under paragraph (2). 316. Strategy to secure email (a) In general Not later than December 31, 2021, the Secretary of Homeland Security shall develop and submit to Congress a strategy, including recommendations, to implement across all United States-based email providers Domain-based Message Authentication, Reporting, and Conformance standard at scale. (b) Elements The strategy required under subsection (a) shall include the following: (1) A recommendation for the minimum size threshold for United States-based email providers for applicability of Domain-based Message Authentication, Reporting, and Conformance. (2) A description of the security and privacy benefits of implementing the Domain-based Message Authentication, Reporting, and Conformance standard at scale, including recommendations for national security exemptions, as appropriate, as well as the burdens of such implementation and an identification of the entities on which such burdens would most likely fall. (3) An identification of key United States and international stakeholders associated with such implementation. (4) An identification of any barriers to such implementing, including a cost-benefit analysis where feasible. (5) An initial estimate of the total cost to the Federal Government and implementing entities in the