United States Statutes at Large/Volume 5/25th Congress/1st Session/Resolution 1
Oct. 12, 1837.
No. 1. A Resolution directing the postage on letters sent by the Express Mail to be paid in advance.
Resolved by the Senate and House of Representatives of the United States of America in Congress assembled,Postage on letters sent by the Express Mail to be paid in advance. That the Postmaster General be, and he is hereby, directed to cause the postage on all letters sent by the Express Mail of the United States to be paid in advance at the time of depositing them for transportation by said mail.
Approved, October 12, 1837.