epistler
/ɪˈpɪslə/ /ɪˈpɪs(ə)lə/noun
1 Christian Church. = epistoler.
2Chiefly literary or (in later use) humorous. The writer of an epistle.
Origin
Mid 16th century; earliest use found in George Cavendish (b. 1494), biographer and poet. From epistle + -er.