This bill would prevent the U.S. Postal Service from closing or consolidating any mail processing and distribution centers in regions that failed to meet specific delivery standards in the previous year. Specifically, the Postal Service would be restricted from making these facility changes in any region that did not achieve at least 93 percent on-time delivery for two-day mail or at least 90.3 percent on-time delivery for three to five-day mail during the prior calendar year. The restriction applies on a year-by-year basis, meaning regions that fail to meet these targets in one year would be protected from closures or consolidations during the following year. The bill affects mail service across all Postal Service regions and aims to maintain service capacity in areas struggling with delivery performance. There is no specific funding authorization or implementation timeline mentioned in the legislation.