\documentclass[fontsize=12pt,paper=a4,DIN]{scrlttr2}
\usepackage[T1]{fontenc}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}

% Setzen der Absenderadresse
\setkomavar{fromaddress}{%
Hackspace e.V. 
Postfach xyz
077xx Jena}
\setkomavar{fromname}{Hackspace Jena e.V.}
\setkomavar{fromemail}{kontakt@hackspace-jena.de}
\setkomavar{place}{Jena}
\setkomavar{signature}{Irgendein Vertreter}

%KOMAscript schön machen
\KOMAoptions{headsepline,%
pagenumber=topright,%
fromalign=center,%
fromrule=on,%
foldmarks=off,%
backaddress=off,%
firstfoot=off,
locfield=wide,%
enlargefirstpage=on,%
parskip=half%
}

\addtokomafont{fromname}{\Large}
\makeatletter
\@setplength{locwidth}{.5\textwidth}
\makeatother

\setkomavar{location}{\raggedleft
  \usekomavar*{fromemail}\usekomavar{fromemail}\\
  \usekomavar*{fromphone}\usekomavar{fromphone}\par
}


\begin{document}

\begin{letter}{zieladresse}

\setkomavar{subject}{Some subject}

\opening{Sehr geehrte Damen und Herren,}

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam 
nonumyeirmod tempor invidunt ut labore et dolore magna aliquyam 
erat, sed diamvoluptua. At vero eos et accusam et justo duo dolores 
et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est 
Lorem ipsum dolor sit amet.Lorem ipsum dolor sit amet, consetetur 
sadipscing elitr, sed diam nonumyeirmod tempor invidunt ut labore et 
dolore magna aliquyam erat, sed diamvoluptua. At vero eos et accusam 
et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea 
takimata sanctus est Lorem ipsum dolor sit amet.Lorem ipsum dolor 
sit amet, consetetur sadipscing elitr, sed diam nonumyeirmod tempor 
invidunt ut labore et dolore magna aliquyam erat, sed diamvoluptua. 
At vero eos et accusam et justo duo dolores et ea rebum. Stet clita 
kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit 
amet.Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed 
diam nonumyeirmod tempor invidunt ut labore et dolore magna aliquyam 
erat, sed diamvoluptua. At vero eos et accusam et justo duo dolores 
et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est 
Lorem ipsum dolor sit amet.Lorem ipsum dolor sit amet, consetetur 
sadipscing elitr, sed diam nonumyeirmod tempor invidunt ut labore et 
dolore magna aliquyam erat, sed diamvoluptua. At vero eos et accusam 
et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea 
takimata sanctus est Lorem ipsum dolor sit amet.Lorem ipsum dolor 
sit amet, consete

\closing{Mit freundlichen Grüßen}



\end{letter}
\end{document}
