\documentstyle[12pt]{letter}
\begin{document}
\address{Graduate School, International Office\\
Virginia Tech\\
Blacksburg, VA 24061\\
{\tt email: tdunbar@vtaix.cc.vt.edu}\\
{\tt phone: 703 231-3938}\\}

\signature{Thomas Dunbar\\
PC Systems Administrator}

\begin{letter}{    \\  %put to: address here
  }

\opening{Dear Sir}

%body of letter




\closing{Sincerely}
\end{letter}
\end{document}
