“Japan Post has announced a temporary suspension of the acceptance of international mail from 126 countries for EMS and Air Mail, and for all types of mail from 27 countries. “
Japan Post has posted on their website as of April 1, 2020 – “The novel coronavirus pandemic has caused many countries/territories to take measures such as stopping acceptance of inbound postal items as well as considerable suspension and reduction of flights from/to Japan. Accordingly, our transportation performance has significantly declined. Therefore, acceptance of international mail items, mainly EMS and parcel-post/letter-post items by air and SAL, will be temporarily suspended from April 2. For details, please see the attachment (PDF16KB).
Items which have already been accepted and cannot be dispatched to their destinations will be returned from the delivery offices to the senders in order. In addition, because of the global reduction of flights, considerable delivery delays are expected for outbound mail items to other countries/territories.
For additional details see- https://www.post.japanpost.jp/int/information/2020/0401_02_en.html