Washington, DC --
DHS has released the notices implementing the President's Executive Orders relating to "Imposing Duties to Address the Flow of Illicit Drugs" concerning Canada and China. (Presumably the notice relating to Mexico will be released shortly.)
While it has been widely reported that the Executive Order eliminates the use of de minimis for duty-free entry of shipments of less than $800 per day (under 19 U.S.C. sec. 1321), an important detail is that international mail shipments from Canada or China are excluded from de minimis and will require the filing of a formal entry.
Although the majority of de minimis shipments are shipped by express air courier, postal shipments are a significant mode of transport for low-value shipments based on CBP's De Minimis Statistics.
For updates on de minimis, check out EMTC's YouTube channel EMTC - Simplifying Global E-Commerce.