We may take it, therefore, that the letter was composed by an educated man who wished to pose as an uneducated one, and his effort to conceal his own writing suggests that that writing might be known, or come to be known, by you.
Podemos deducir, por consiguiente, que quien compuso la carta es una persona educada que ha querido hacerse pasar por inculta y que su preocupación por ocultar su letra sugiere que quizá alguno de ustedes la conozca o pueda llegar a conocerla.