Late 18th century. From post-classical Latin epistolographia letter-writing from Hellenistic Greek ἐπιστολογράϕος letter-writer, secretary + classical Latin -ia.
Definition of epistolography in US English:
epistolography
nounɪˌpɪstəˈlɒɡrəfi
rare, formal
Letter writing.
Origin
Late 18th century. From post-classical Latin epistolographia letter-writing from Hellenistic Greek ἐπιστολογράϕος letter-writer, secretary + classical Latin -ia.