39 CFR § 958.20 - Service.

---
identifier: "/us/cfr/t39/s958.20"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "39 CFR § 958.20 - Service."
title_number: 39
title_name: "Postal Service"
section_number: "958.20"
section_name: "Service."
chapter_name: "UNITED STATES POSTAL SERVICE"
subchapter_number: "N"
subchapter_name: "PROCEDURES"
part_number: "958"
part_name: "HAZARDOUS MATERIALS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "39 U.S.C. 204, 401, 3001, 3018; 5 U.S.C. 554."
regulatory_source: "74 FR 18631, Apr. 24, 2009, unless otherwise noted."
cfr_part: "958"
---


# 958.20 Service.

If both parties are participating in the electronic filing system, separate service upon the opposing party is not required. Otherwise, documents shall be served personally or by mail on the opposing party, noting on the document filed, or on the transmitting letter, that a copy has been so furnished.

[81 FR 40194, June 21, 2016]