--- a/thesis/tex/1-Introduction.tex	Fri Jan 09 14:21:45 2009 +0100
+++ b/thesis/tex/1-Introduction.tex	Fri Jan 09 14:22:06 2009 +0100
@@ -7,6 +7,18 @@
 
 
 
+\section{What's an MTA?}
+
+The basic job of a \mta\ is to transport mail from senders to recipients. This is the definition of such kind of software, and this is how \MTA{}s are generally seen \cite[page 19]{dent04} \cite[pages 3-5]{hafiz05}.
+
+An \MTA\ therefore needs at least a mail receiving facility and a mail sending facility.
+
+<< structure diagram of an MTA (and of masqmail) >>
+
+
+
+
+
 \section{The \masqmail\ project}
 \label{sec:masqmail}
 
@@ -58,6 +70,9 @@
 A better setup is to run \masqmail\ on every machine %FIXME
 
 
+\subsubsection{Online detection and routes}
+\label{sec:masqmail-routes}
+
 ---
 
 As \masqmail\ is focused on non-permanent Internet connections, online state can be queried by three methods: reading from a file, reading the output of a command, or by asking an \name{mserver}. Each method may return a string indicating one of the available routes being online, or returning nothing to indicate offline state.
@@ -66,6 +81,8 @@
 
 ---
 
+\masqmail\ focuses on non-permanent online connections, thus a concept of online routes is used. One may configure any number of routes to send mail. Each route can have criteria, like matching \texttt{From:} or \texttt{To:} headers, to determine if some message is allowed to be sent over it. Mail to destinations outside the local network gets queued until an online connections is available.
+