\setkomavar{fromname}{Florian Bruhin}
\setkomavar{fromaddress}{Ruchwiesenstrasse 36 \\ 8404 Winterthur}
\setkomavar{fromphone}{076 412 84 21}
\begin{document}
\begin{letter}{foobar AG \\ Beispielstrasse 68 \\ 1337 Neverland}
\setkomavar{subject}{Sponsorenantrag}
\opening{Sehr geehrte Damen und Herren,}
\closing{Mit freundlichen Grüssen}
\encl{Projektdossier}
\end{letter}
\end{document}
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