\documentclass[brev,12pt]{astroteo}
\name{Prof. Michael Kachelrie\ss}

\usepackage{amsfonts}


\begin{document}
\selectlanguage{english}
\vdato{\today}
%
%
\begin{letter}{
Address}

  
\vspace*{1ex}
\opening{Subject}

\bigskip

Dear Colleagues,
\bigskip

Sincerely yours,  Michael Kachelrie\ss

\end{letter}
\end{document}
