\section{Rule number 2: plain text}
\begin{frame}{De facto standard I}
    The Linux kernel mailing list simply rejects any HTML e-mail~\cite{netiquette:lkml}.\vspace{1em}

    \begin{quote}
        HTML e-mail - even when it is a multipart mail with a corresponding plain/text section - is unconditionally rejected by mailing lists.
    \end{quote}
\end{frame}
\begin{frame}{De facto standard II}
    The MediaWiki mailing list etiquette prohibits their use~\cite{netiquette:mediawiki}.\vspace{1em}

    \begin{quote}
        Don't send HTML email to the list, use text only. Also, don't send dual-format mails containing both text and HTML.
    \end{quote}
\end{frame}
\begin{frame}{De facto standard III}
    And the curl maintainer really hates them~\cite{netiquette:curl}.\vspace{1em}

    \begin{quote}
        Please switch off those HTML encoded messages. You can mail all those \textbf{funny mails} to your friends.\vspace{0.5em}

        \textbf{We speak plain text mails}.
    \end{quote}
\end{frame}
\begin{frame}{How to (Thunderbird)}
    \centering
    \includegraphics[scale=0.35]{target/slides-thunderbird-plain-text.png}
\end{frame}
\begin{frame}{How to (neomutt)}
    Neomutt sends plain text emails by default.
\end{frame}