To buy items over the internet with delivery via mail; also known as [[线上邮购|線上郵購|xian4 shang4 you2 gou4]] or [[网络邮购|網路郵購|wang3 lu4 you2 gou4]].

to purchase goods over the internet for delivery by mail

system of ordering goods via the internet for delivery by mail or courier

A store that sells goods directly to customers through the postal service, typically based on a product catalog or price list.