\documentclass[12pt]{article}
\usepackage[letterpaper,margin=1.25in]{geometry}
\usepackage{parskip}

\begin{document}

% Conservative header with minimal spacing
\begin{flushright}
\today
\end{flushright}

\vspace{0.3cm}

% Sender information (top left)
\begin{minipage}[t]{0.4\textwidth}
    Philipp Waibel\\
    Zelgistrasse 2\\
    8266, Steckborn\\
    % Phone: +41 76 563 95 06
\end{minipage}

\vspace{0.5cm}

% Recipient information
\begin{flushright}{\textwidth}
    Recipient Name \\
    Recipient Title \\
    Company Name \\
    Company Address \\
    City, State ZIP
\end{flushright}

\vspace{1cm}

% Letter content with traditional spacing
Dear [Recipient Name],

\vspace{0.5cm}

[This template uses a narrow, conservative layout befitting formal correspondence. The design is minimalistic and professional.]

\vspace{0.5cm}

Thank you for your consideration.

\vspace{1.5cm}

Sincerely,

\vspace{0.5cm}

Your Name

\vspace{0.5cm}

Anhang:
\begin{itemize}
  \item test
  \item test 2
\end{itemize}

\end{document}