6 CFR 13.8 - Service of Complaint.
(a) Service of a Complaint must be Made by certified or registered mail or by delivery in any manner authorized by Rule 4(d) of the Federal Rules of Civil Procedure. Service of a Complaint is complete upon receipt.
(2) A United States Postal Service return receipt card acknowledging receipt; or
(4) In case of service abroad, authentication in accordance with the Convention on Service Abroad of Judicial and Extrajudicial Documents in Commercial and Civil Matters.