Postmark
Postmark means independently verifiable evidence of the date of mailing, such as a U.S. Postal Service postmark, or other private carrier postmark, certified mail receipt, overnight mail receipt, or a receipt issued upon hand delivery to a representative of NMFS authorized to collect fishery statistics.
Source
50 CFR § 600.10
Scoping language
Unless defined otherwise in other parts of Chapter VI, the terms in this chapter have the following meanings: