keypals

/ˈkiːpælz/
noun
  1. A person with whom one regularly exchanges emails or online messages, especially as part of a language-learning or cultural exchange program.
    • I've been writing to my keypal in Japan for two years now.
    • The teacher paired each student with a keypal from a school in Mexico.
    • My keypal sends me photos of her city and I send her pictures of mine.