anonymous shipping; anonymous delivery
A service where the sender's personal information is not disclosed to the recipient, commonly used in online marketplaces and auction sites.
On flea market apps, if you choose anonymous shipping, you can complete the transaction without sharing each other's addresses.
Means 'anonymous' or 'anonymity' in general; 匿名配送 specifically refers to the shipping method.
Means 'delivery' or 'shipping'; 匿名配送 is a specific type of delivery service.
Compound of 匿名 (とくめい, 'anonymous') and 配送 (はいそう, 'delivery/shipping').