43 CFR §4.721

1. (a)Electronic. A document filed electronically is deemed timely if filed by 11:59 p.m. Central Time on the date the document is due under the terms specified in the OHA Standing Order on WELSA Proceedings.
2. (b)Non-electronic. A document not filed electronically is deemed timely if, on or before the last day for filing, it is sent by first-class United States mail, or other class of mail that is at least as expeditious, postage prepaid; or it is dispatched to a commercial courier for delivery within 3 days. The date of mailing or dispatch must be documented by a postmark date, acceptance scan, receipt, or similar written acknowledgement from the company delivering the document for filing. A document not received within 7 business days of the filing deadline is presumed untimely, but the presumption may be overcome by the documentation establishing the date of mailing or dispatch.