§951.4. Authorization of appearance may be required. — Inbound Citations

(d) When any person acting in a representative capacity appears in person or signs a paper in practice before the Postal Service his personal appearance or signature shall constitute a representation to the Postal Service that under the provisions of this part and the law he is authorized and qualified to represent the particular party in whose behalf he acts. The Postal Service does not generally take formal action or issue any certificate to show that an individual is eligible to practice before it. (See § 951.4.)