a written communication

Missive

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Missive

\ ˈmi-siv \ – noun

a written communicationmerriam-webster.com
There are a number of suitably strange points buried in these missives.Jack Holmes, Esquire, "Suddenly, Trump Breaking His Promises Is Great for the Planet," 18 Sep. 2017
dispatch, epistle, memo, memorandum, 1letter, noteSynonyms