While post offices across the US will not be affected by a shutdown of the federal government (contrary to what you might have heard, the USPS is in much better financial shape than the rest of the government), the Postal Regulatory Commission will have to close if Congress causes a shutdown. The PRC has just posted the following on its web site:
April 07, 2011 – If the current continuing resolution expires at 12:01 a.m. on April 9, 2011 without passage of an FY 2011 appropriations bill or a further continuing resolution, the Postal Regulatory Commission will be required to shut down.
In that event, effective April 11, 2011, the Commission will be closed until such time as an FY 2011 appropriation or a continuing resolution for the Commission has been approved. With respect to proceedings pending before the Commission, the due date for all filings will be extended day-for-day for the duration of the shutdown. Thus, if the shutdown lasts a total of seven (7) calendar days, the due date for all filings otherwise due during the shutdown is extended by seven (7) days from the due date. For example, assuming an initial due date of April 13, 2011 and a 7-day shutdown which concludes April 18, 2011, the revised due date is April 20, 2011. During the shutdown, the Commissionâ€™s Docket section will not be operational. However, filings may be submitted. All filings submitted during the shutdown will be processed and posted to the Commissionâ€™s website when the Commission resumes normal operations.