49 CFR § 386.6 - Service.
(a) General. All documents must be served upon the party or the party's designated agent for service of process. If a notice of appearance has been filed in the specific case in question in accordance with § 386.4, service is to be made on the party's attorney of record or its designated representative.
(b) Type of service. A person may serve documents by personal delivery utilizing governmental or commercial entities, U.S. mail, commercial mail delivery, and upon prior written consent of the parties, facsimile. Written consent for facsimile service must specify the facsimile number where service will be accepted. When service is made by facsimile, a copy will also be served by any other method permitted by this section. Facsimile service occurs when transmission is complete.
(c) Certificate of service. A certificate of service will accompany all documents served in a proceeding under this Part. The certificate must show the date and manner of service, be signed by the person making service, and list the persons served in accordance with § 386.7.
(d) Date of service. A document will be considered served on the date of personal delivery; or if mailed, the mailing date shown on the certificate of service, the date shown on the postmark if there is no certificate of service, or other mailing date shown by other evidence if there is no certificate of service or postmark.
(e) Valid service. A properly addressed document, sent in accordance with this subpart, which was returned, unclaimed, or refused, is deemed to have been served in accordance with this subpart. The service will be considered valid as of the date and the time the document was mailed, or the date personal delivery of the document was refused. Service by delivery after 5 p.m. in the time zone in which the recipient will receive delivery is deemed to have been made on the next day that is not a Saturday, Sunday, or legal holiday.
(f) Presumption of service. There shall be a presumption of service if the document is served where a party or a person customarily receives mail or at the address designated in the entry of appearance. If an entry of appearance has been filed on behalf of the party, service is effective upon service of a document to its representative.