\begin{verbatim}
 +-------------------------------------------------+
 |                                                 |
 |                                                 |
 |                                                 |
 |                                                 |
 |            masqmail's architecture              |
 |                                                 |
 |                                                 |
 |                                                 |
 |                                                 |
 |                                                 |
 |                                                 |
 |                                                 |
 +-------------------------------------------------+
\end{verbatim}
