\RequirePackage[l2tabu,orthodox]{nag}
\documentclass[11pt,letterpaper,twoside]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[total={6.5in,10in},left=1in,top=0.5in,includehead,includefoot]{geometry}
\usepackage{graphicx}
\raggedbottom
\usepackage{parskip}
\setlength{\parindent}{15pt}
\usepackage{lipsum}
\begin{document}
\noindent\includegraphics[height=0.5in]{example-grid-100x100pt}
\vfill
\begin{center}
\Large\textsc{Memorendum}
\end{center}
\vfill
\begin{flushleft}
\textbf{\textsf{To :}} Mr. Unknown \par
\textbf{\textsf{From :}} Tom \par
\textbf{\textsf{Subject :}} Some fancy subject \par
\textbf{\textsf{Date :}} \today
\end{flushleft}
\vfill
\hrule
\vfill
\lipsum[1-4]
\end{document}