% ---------------------------------------------------------------------------- %
%% \file exenv.tex
%% \author Sebastien Beaugrand
%% \sa http://beaugrand.chez.com/
%% \copyright CeCILL 2.1 Free Software license
% ---------------------------------------------------------------------------- %
\documentclass{enveloppe}
\begin{document}

\def\des{%
  \destinataire{%
    ART ET HISTOIRE D'EUROPE\\
    10 RUE FRIANT\\
    75014 PARIS}
}
\def\exp{%
  \expediteur{%
    Sébastien Beaugrand\\
    rue Raymond Losserand\\
    75014 Paris}
}

\makeatletter\def\e@c{black}\makeatother  % Option test
\des\newpage\exp

\newpage

\makeatletter\def\e@a{flushright}\makeatother  % Option droite
\des\newpage\exp

\newpage

\makeatletter\def\e@c{white}\makeatother  % Option normal
\des\newpage\exp

\newpage

\makeatletter\def\e@a{center}\makeatother  % Option centre
\des\newpage\exp

\end{document}