\documentclass[
    foldmarks=true,      % print foldmarks
    foldmarks=BTm,       % show foldmarks top, middle, bottom
    fromalign=right,     % letter head on the right
    fromphone,           % show phone number
    fromemail,           % show email
    fromlogo,            % show logo in letter head
    version=last         % latest version of KOMA letter
]{scrlttr2}

\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{parskip}

\usepackage{graphics}

\usepackage{longtable}
\usepackage{booktabs}

\makeatletter
    \setlength{\@tempskipa}{-1.2cm}%
    \@addtoplength{toaddrheight}{\@tempskipa}
\makeatother

\setlength{\oddsidemargin}{\useplength{toaddrhpos}}
\addtolength{\oddsidemargin}{-1in}
\setlength{\textwidth}{\useplength{firstheadwidth}}

\begin{document}
    \setkomavar{fromname}{$author$}
    \renewcommand*{\raggedsignature}{\raggedright}
    \setkomavar{fromaddress}{
        $for(return-address)$
            $return-address$$sep$\\
        $endfor$
    }
    \setkomavar{fromphone}{$phone$}
    \setkomavar{fromemail}{$email$}
    \setkomavar{signature}{$author$}

    \setkomavar{date}{$date$}
    \setkomavar{place}{$place$}

    \setkomavar{subject}{$subject$}

    \begin{letter}{%
        $for(address)$
            $address$$sep$\\
        $endfor$
    }

        \opening{$opening$}

        $body$

        \closing{$closing$}

        \ps $postskriptum$

        $if(encludes)$
            \setkomavar*{enclseparator}{Anlage}
            \encl{$encludes$}
        $endif$
    \end{letter}
\end{document}