The term respondent means the U.S. Postal Service. Postal Service counsel, who shall be an attorney at law licensed to practice in a state, commonwealth, or territory of the United States, or in the District of Columbia, designated by the General Counsel, will represent the interest of the Postal Service before the Board. Postal Service counsel shall register in the electronic filing system, and file a written notice of appearance with the Board. The notice of appearance must include an email address, mailing address, telephone number, fax number, and a jurisdiction in which the attorney is licensed to practice law.