based on the scrlltr2 class. Address and location field and header were manually set to comply to the parameters of DIN5008A (small letter head)
\begin
Discover why 18 million people worldwide trust Overleaf with their work.
% Letter template which should agree largely with DIN5008A https://de.wikipedia.org/wiki/DIN_5008
%
% Till Blaha 2023, Creative Commons
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% Configuration
% According to DIN5008A, the height of the right-hand location field can vary between 40 and 75mm
% you can set this value accordingly, if you need more vertical space in that field
\newcommand{\mylocheight}{40mm}
% show foldmarks?
\newcommand{\showfoldmarks}{on} % on or off
% include the preamble
\input{preamble.tex}
%%% uncomment these 2 lines to make sure the boxes for address and location are not overrun
\LoadLetterOption{visualize}
%\showfields{head,address,location,refline,foot}
%%%%%%%%%%%%%%%%%%%%%%%%%% Content %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%
% Sender Variables %
%%%%%%%%%%%%%%%%%%%%
\setkomavar{fromname}{John Doe}
\setkomavar{fromaddress}{Freedom Drive 1960\\12345 City\\Country}
\setkomavar{fromphone}{+31 6 123 456 78}
\setkomavar{fromemail}{email@example.com}
\setkomavar{backaddressseparator}{\ \textperiodcentered \ }
\setkomavar{signature}{\hspace{5mm}\includegraphics[scale=1]{Signature}\\John Doe} % with scanned signature
%\setkomavar{signature}{\vspace{10mm} \\ John Doe} % without scanned signature
\setkomavar{place}{Some City}
\setkomavar{date}{\today}
\setkomavar{enclseparator}{: }
%%%%%%%%%%%%%%%%%%%%%%%%
% Letterhead variables %
%%%%%%%%%%%%%%%%%%%%%%%%
\setkomavar{letterheadsubtitle}{Aerospace Engineer}
%%%%%%%%%%%%%%%%%%%%%%
% Location Variables %
%%%%%%%%%%%%%%%%%%%%%%
\setkomavar{location}{
\newline\vspace{-18pt}% no idea why this hack is needed to align the table to the left
\begin{tabbing}
\hspace{35mm} \= \hspace{25mm} \= \kill % Spacing within the block
Reference Number: \> 123456789\\
Client Number: \> 202012345\\
Telephone: \> \usekomavar{fromphone}\\
Email: \> \usekomavar{fromemail}
\end{tabbing}
}
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Addressee %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{letter}{%
Addressee \\
Address line 1 \\
Address line 2 \\
Address line 3 \\
1234 AB Stad \\
les Pays-Bas
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Start of Actual Content of the Letter %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\setkomavar{subject}{Letter of Motivation supporting my \LaTeX{} Template}
\opening{To whom it may concern,} % 100 words
\lipsum[1-4]
\vspace*{5mm}\textbf{Subsection Headline}
\lipsum[5]
\closing{Met vriendelijke groet,}
%%%%%%%%%%%%%%%%%%%%%%%
% Enclosures %
%%%%%%%%%%%%%%%%%%%%%%%
\encl{\textit{Proof (2 pages),\\ More Proof (7 pages)}}
%%%%%%%%%%%%%%%%%%%%%%%
% End of Tex Document %
%%%%%%%%%%%%%%%%%%%%%%%
\end{letter}
\end{document}