\chapter*{Requests for Comments}

\name{Requests for Comments} are the documents that propose or define Internet standards and best practices. They are controlled by the \name{Internet Engineering Task Force} (short: \NAME{IETF}) \citeweb{ietf:homepage}.
\index{ietf}

A particular \RFC\ is located at {\small\url{http://tools.ietf.org/rfc/rfcNNNN.txt}}\,, where ``\texttt{NNNN}'' is the four-digit number of that \RFC. For example is \RFC\,821 located at {\small\url{http://tools.ietf.org/rfc/rfc0821.txt}}\,.
\index{rfc}

More comfortable to browse are the \NAME{HTML} formatted representations which contain navigation hyperlinks. They are accessible at {\small\url{http://tools.ietf.org/html/rfcNNNN}}\,.

Following is a list of \RFC{}s which are relevant for this thesis. An extensive list of mail-related \RFC{}s is available at \citeweb{imc:mail-rfcs}.

\begin{description}
\item[\RFC\,821] \emph{Simple Mail Transfer Protocol} \obsoleted{2821}
\item[\RFC\,822] \emph{Standard for the format of \NAME{ARPA} Internet text messages} \obsoleted{2822}
\item[\RFC\,2487] \emph{\SMTP\ Service Extension for Secure \SMTP\ over \NAME{TLS}} \obsoleted{3207}
\item[\RFC\,2505] \emph{Anti-Spam Recommendations for \SMTP\ \MTA{}s}
\item[\RFC\,2554] \emph{\SMTP\ Service Extension for Authentication} \obsoleted{4954}
\item[\RFC\,2821] \emph{Simple Mail Transfer Protocol} \obsoleted{5321}
\item[\RFC\,2822] \emph{Internet Message Format} \obsoleted{5322}
\item[\RFC\,3207] \emph{\SMTP\ Service Extension for Secure \SMTP\ over Transport Layer Security}
\item[\RFC\,4954] \emph{\SMTP\ Service Extension for Authentication}
\item[\RFC\,5321] \emph{Simple Mail Transfer Protocol}
\item[\RFC\,5322] \emph{Internet Message Format}
\end{description}

\index{smtp}
\index{mail message}
\index{smtps}
\index{spam}
\index{auth!smtp-auth}
\index{starttls}