\documentclass[12pt]{letter}

\usepackage{utpaletter}

\name{Dr. Eleftherios Gkioulekas}
\department{Department of  Mathematics}
\location{1201 West University Drive}
\telephone{e-mail: {\small\tt drlf@hushmail.com}}
\mailcode{2999} 

\usepackage{geometry}
\geometry{margin=1.5cm,hoffset=0pt,voffset=0pt}

\begin{document}

\begin{letter}{}

\opening{To Whom It May Concern,  }



\closing{Yours sincerely,}

\end{letter}
\end{document}