On 18th June, the website of the National Customs Brokers & Forwarders Association of America carried a report saying that on 14th June, the House of Representatives approved legislation requiring mandatory advance electronic information for international mail shipments, known as the Securing the International Mail Against Opioids Act the Bill authorizes the Secretary of Homeland Security to prescribe regulations requiring the US Postal Service to transmit advanced electronic information to CBP comparable to information required for non-mail cargo. The requirements are to be phased in incrementally, with a deadline of December 31st 2020. The Bill now goes to the Senate.
https://www.congress.gov/crec/2018/06/14/CREC-2018-06-14-pt1-PgH5163-6.pdf