%\documentclass[swedish]{kthletter-utf8}
\documentclass[english]{kthletter-utf8}
% works for both swedish and english (see above for how to select.)

\usepackage{amsmath,amssymb}

\begin{document}
\begin{letter}{REPLACE THIS WITH RECIPIENT ADDRESS/WHATEVER} 
%\opening{Dear ,}
\opening{Kära ,}
This is the body of the letter.
%\closing{Yours sincerely,}
\closing{Vänliga hälsningar,}
%\encl{Enclosure}
%\cc{Copy}
%\ps PS
\end{letter}
\end{document}
