A person who communicates regularly with another person, typically through letters or emails.

पत्राचार करने वाला

English Usage: She was his correspondent for many years, exchanging letters about their lives.

Hindi Usage: वह कई वर्षों तक उसकी पत्राचारकर्ता रही, उनके जीवन के बारे में पत्रों का आदान-प्रदान करती रही।