Some countries have suspended all inbound mail (such as Peru, Panama and more) – while about 80 countries currently lack inbound transportation for mail transport. The latter, presumably, because of the shut down of international air traffic.
Sending mail to about half of the world’s countries is currently and indefinitely suspended.
These shutdowns, and the effects on people were of course, fully modeled by the UW IHME and the Imperial College of London as part of their pandemic response models. Of course. /satire