Postmark Ganymede by Robert Silverberg

Postmark Ganymede is a science fiction short story by Robert Silverberg featuring the postman of the future. Consider the future, not only will the postman still have to consider sleet, snow and "Dead of Night" (Zombies?) but also meteors, comets and the cold hard vacuum of space.

Postmark Ganymede first appeared in the magazine Amazing Stories in 1957 and was later published in The Most Thrilling Science Fiction, July 1975 before being made available via open source in 2008.