45 CFR § 4.4
§ 4.4 Acknowledgement of mailed process.
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
The Department will not provide a receipt or other acknowledgement of process received, except for a return receipt associated with certified mail and, where required, the acknowledgement specified by Rule 4(c)(2)(C) of the Federal Rules of Civil Procedure.
eCFR data current as of: June 10, 2026
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