Paraepistolary types within other genres

1 - Public letters

  1a - In books: the prefatorial letter (letter to the author); letter to the reader by the author; epistolary dedications

  1b - In newspapers: letter from the reader, the "open letter"

2 - Letters as literature

  2a - Epistolary poems

-- MIRANDA, Sá de (1487-1558)
-- GONZAGA, Tomás Antônio (1744-1810)

  -- Studies

3 - Epistolary didactics

  3a - The epistolary chronicle, memoir, autobiography

  -- Studies

  3b - The epistolary treaty and essay (moral, pedagogical, scientific, etc.)