PostPet

PostPet (ポストペット, Posutopetto), commonly abbreviated as Posupe (ポスペ) in Japanese, is a hybrid virtual pet and email client software developed by PetWorks and So-net and first released in Japan in November 1997. The software is designed for computer novices. It takes place in a virtual room, allowing the user's pet to send and receive email messages. Multiple versions of the software have been released over the years, and the franchise has received adaptations into other forms of media, such as an anime series and multiple video games.

The software was successful and well-received for its appeal to new computer users, especially children and young women, with over 100,000 copies sold in less than a year. On the other hand, critics and journalists have noted that it is not well-suited for professional use.