"The mails, unless repelled, will continue to be furnished in all parts of the Union. So far as possible the people everywhere shall have that sense of perfect security which is most favorable to calm thought and reflection. The course here indicated will be followed unless current events and experience shall show a modification or change to be proper, and in every case and exigency my best discretion will be exercised, according to circumstances actually existing and with a view and a hope of a peaceful solution of the national troubles and the restoration of fraternal sympathies and affections." -- Abraham Lincoln, March 4, 1861
Maybe it was all about mail delivery?
You are truly a genius. You are the first person to explain why Lincoln proclaimed a blockade of the post offices.