1) Epistolatory 2) Epistolic 1) Epistolatory 2) Informal 
of, like or pertaining to letters
• (a.) Contained in letters; carried on by letters. • (a.) Pertaining to epistles or letters; suitable to letters and correspondence; as, an epistolary style.
Taking the form of a letter, or actually consisting of a letter written to another. For instance, se
E·pis'to·la·ry adjective [ Latin epistolaris , from epistola : confer French épistolaire .] 1. Pertaining to epistles or letters; suitable to letters and correspondence; as, an epistolary style. 2. Contained in letters; carried on by letters. ' Epist...
[adj] - written in the form of or carried on by letters or correspondence
epistolatory adjective written in the form of or carried on by letters or correspondence; `an endless sequence of epistolary love affairs`; `the epistolatory novel`
contained in or carried on by letters: an epistolary friendship. · of, pertaining to, or consisting of letters.