Epistolographic mode of writing

from The Collaborative International Dictionary of English v.0.48

Epistolographic \E*pis`to*lo*graph"ic\, a. [Gr. ?: cf. F.
   ['e]pistolographique.]
   Pertaining to the writing of letters; used in writing
   letters; epistolary.
   [1913 Webster]

   {Epistolographic character of writing} or {Epistolographic
   mode of writing}, the same as {Demotic character}. See under
      {Demotic}.
      [1913 Webster]