One involved in foreign exchange?

• Foreign stamp collector?
• Far and away one's favorite writer?
• Faraway friend who likes to write
• Long-distance friend
• Foreign correspondent, maybe
• Photo requester, maybe
• Letter-writing buddy
• Snail mail buddy

Wikipedia Word definitions in Wikipedia
Penpal is a 2012 self-published horror thriller novel and the debut novel of American author Dathan Auerbach. The work was first published in paperback on July 11, 2012 through 1000Vultures and is based on a series of popular creepypasta stories that Auerbach ...

Wiktionary Word definitions in Wiktionary
n. (alternative spelling of pen pal English)