325.12—Service of documents.
         Any person, except one filing individually as a consumer, who files a document under this part, including responses to the questionnaire, shall serve that document upon those listed in  § 325.4(a) of this part and upon the following:
    
    
    
    
    
        
        (d) 
         The U.S. Postal Service, Assistant General Counsel, Transportation Division, Law Department, Washington, D.C. 20260.