The sentence “The ‘postcat’ helped its owners to make friends with their neighbors” means that the cat owned by Zach King and Olga Shipunova became a way for them to form friendships with their neighbors.
The cat, named Billy, would often go out for walks on his own, and one day he returned with a note attached to his collar. The note was from a person who had grown attached to Billy and wanted to connect with his owners.
This led to correspondence between the two parties, which eventually developed into a genuine friendship. The owners do not plan to meet their new acquaintances in person but are satisfied with their correspondence.
Additionally, Zach has expressed a desire to create “cat mail” to help neighbors get to know each other better.
