Early 19th century; earliest use found in Thomas F. Dibdin (1776–1847), bibliographer. From Hellenistic Greek ἐπιστολογράϕος letter-writer, secretary + -ist.
Definition of epistolographist in US English:
epistolographist
nounɪˌpɪstəˈlɒɡrəfɪst
literary
A writer of letters.
Origin
Early 19th century; earliest use found in Thomas F. Dibdin (1776–1847), bibliographer. From Hellenistic Greek ἐπιστολογράϕος letter-writer, secretary + -ist.