1.1 --- a/thesis/tex/2-MarketAnalysis.tex	Sun Jan 04 22:36:53 2009 +0100
     1.2 +++ b/thesis/tex/2-MarketAnalysis.tex	Sun Jan 04 22:57:49 2009 +0100
     1.3 @@ -127,7 +127,7 @@
     1.4  The market's main threat is \emph{spam}, also named \name{junk mail} or \name{unsolicited commercial email} (\NAME{UCE}). David~A.\ \person{Wheeler} is clear about it:
     1.5  \begin{quote}
     1.6  Since \emph{receivers} pay the bulk of the costs for spam (including most obviously their time to delete all that incoming spam), spam use will continue to rise until effective technical and legal countermeasures are deployed, \emph{or} until people can no longer use email.
     1.7 -\cite{wheeler03}
     1.8 +\hfill\cite{wheeler03}
     1.9  \end{quote}
    1.10  The amount of spam is huge. Panda Security and Commtouch state in their \name{Email Threats Trend Report} for the second Quarter of 2008: ``Spam levels throughout the second quarter averaged 77\,\%, ranging from a low of 64\,\% to a peak of 94\,\% of all email [...]''\cite[page 4]{panda:email-threats}. The report sees the main reason in the bot nets consisting of zombie computers: ``Spam and malware levels remain high for yet another quarter, powered by the brawny yet agile networks of zombie \NAME{IP}s.''\cite[page 1]{panda:email-threats} This is supported by IronPort Systems: ``More than 80 percent of spam now comes from a `zombie'---an infected \NAME{PC}, typically in a consumer broadband network, that has been hijacked by spammers.''\cite{ironport:zombie-computers}. Positive for \MTA{}s is, that they are not the main source for spam, but it is only a small delight. Spam is a general weakness of the email system, because it can not prevent it.
    1.11