A person who writes epistles or letters, especially one who is skilled at or devoted to epistolary composition.
From epistle plus the suffix -ist (one who practices or advocates for something), as in pianist, novelist, or journalist. This emphasizes specialized skill or dedication.
An epistolist is to letter-writing what a pianist is to piano-playing—it implies real skill and devotion, not just casual note-writing; think of the great letter-writers like Lord Byron or Oscar Wilde.
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