The postage stamps and postal system of the Confederate States of America carried the mail of the Confederacy for a brief period in American history. Early in 1861 when South Carolina no longer considered itself part of the Union and demanded that the U.S. Army abandon Fort Sumter, plans for a Confederate postal system were already underway. Indeed, the Confederate Post office was established on February 21, 1861; and it was not until April 12 that the American Civil War officially began, when the Confederate Army fired upon US soldiers who had refused to abandon the fort. However, the United States Post Office Department continued to handle the mail of the seceded states as usual during the first weeks of the war. It was not until June 1 that the Confederate Post office took over collection and delivery, now faced with the task of providing postage stamps and mail services for its citizens.
The CSA Constitution had provided for a national postal service to be established, then required it to be self-financing beginning March 1, 1863 (Section 8. Powers of Congress, Item 7). President Jefferson Davis had appointed John Henninger Reagan on March 6, 1861, to head the new Confederate States of America Post-office Department. The Confederate Post Office proved to be very efficient and remained in operation for the entire duration of the Civil War.
During the first seven weeks of the Civil War, the US Post Office still delivered mail from the seceded states. Mail that was postmarked after the date of a state’s admission into the Confederacy through May 31, 1861, and bearing U.S. (Union) postage is deemed to represent 'Confederate State Usage of U.S. Stamps'. i.e., Confederate covers franked with Union stamps. After this time, private express companies still managed to carry the mail across enemy lines. The three major express companies in operation throughout the south were Adams Express, American Letter Express, and Whiteside's Express. They had been operating freely for approximately two months when the U.S. Post Office ordered an end to such traffic, effective August 26, 1861. Mail destined to states that were not among their own unions now had to be sent by Flag of Truce, although some express companies still continued to run their mail operations illegally; Adams continued its Southern operations under a nominally-separate Southern Express Company, in actuality a subsidiary. Mail was also smuggled in and out by blockade-running ships—which, however, were often captured or destroyed by Union ships on blockade patrol. Because Confederate post offices existed for only a few years and official and informal records of them are lacking, relatively little is known about their operations in many regions of the South. Existing data has been studied by several experts in the field, who have reconstructed an account of their existence and operation largely from surviving Confederate covers (stamped-addressed envelopes), and by researchers specializing in advanced studies of Confederate philately, notably Colonel Harvey E. Sheppard, United States Army, Fort Hood, Texas; the late Van Dyk MacBride, Newark, New Jersey; George N. Malpass, St. Petersburg, Florida; Earl Antrim, Nampa, Idaho; David Kohn, Washington, D. C., and a few others, each contributing material in the concerted effort to create an overall account of Confederate postal history.