\documentclass[a4paper,french,11pt,origdate]{lettre}

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

\begin{document}
\begin{letter}{az}
    \name{az}
    \address{az}
    \notelephone
    \nofax
    \lieu{Paris}
    \opening{Monsieur,}
    Contenu de la lettre
    \closing{Veuillez agréer, Monsieur, mes meilleures salutations}
\end{letter}
\end{document}
