In the USA, this law exists for physical mail: https://about.usps.com/publications/pub300a/pub300a_v04_revision_072019_tech_021.htm https://about.usps.com/publ

In the USA, this law exists for physical mail: https://about.usps.com/publications/pub300a/pub300a_v04_revision_072019_tech_021.htm https://about.usps.com/publications/pub300a/pub300a_v04_revi... I'm not sure that it has been applied to email, but that would make for some very interesting cases. (Is Intellectual Property merchandise? Rights assigned to the content of the message?)