The Congressional Frank is regulated by the House Commission on Congressional Mailing Standards. The Commission has set specific rules governing what can and cannot be sent under the Frank. The publication "Regulations on the Use of the Congressional Frank By Members of the House of Representatives and Rules of Practice in Proceedings Before the House Commission on Congressional Mailing Standards" is available to help you better understand what material can be sent under the Frank. The Commission office is 140 Cannon HOB, Phone (202) 225-9337.