\documentclass[12pt]{lettre}
\usepackage[utf8x]{inputenc} \usepackage{ucs}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage[french]{babel}
\institut{gk}
\signature{§SIGNATURE§} 
\begin{document} 
\begin{letter}{§RECIPIENT§} 
\opening{§HELLO§} 
 
§BODY§
 
\closing{§GOODBYE§} 
%\cc{Cclist} 
%\ps{adding a postscript} 
%\encl{list of enclosed material} 
\end{letter} 
\end{document}