When filing a document with the United States Department of Labor, Office of Administrative Law Judges (OALJ), you are required also to serve it on every party in accordance with 29 C.F.R. § 18.30(a).  You must document that service with a certificate of service.   A certificate of service is a signed written statement that the paper was served on all parties.  See 29 C.F.R. § 18.30(a)(3).  Sample Certificate of Service.  

If you e-file using the e-file/e-service system (“EFS”) at efile.dol.gov, EFS will e-serve your filings on any party which is also using EFS for e-filing.  Because parties may opt to use EFS at any point in the OALJ proceeding, you must check your EFS dashboard to determine who is currently being served by EFS.  If a party is not using EFS, you must serve that party yourself by one of the means permitted by § 18.30(a)(ii).  How to determine who is being served by EFS

If you e-file using OALJ’s e-mail e-filing system under the procedures stated at www.dol.gov/agencies/oalj/FILING_BY_EMAIL, you must serve the other parties in the case yourself.  OALJ will not perform this service on your behalf.