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comparison thesis/tex/4-MasqmailsFuture.tex @ 366:80b2e476c2e3

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a lot of cleanup
author meillo@marmaro.de
date Fri, 30 Jan 2009 21:20:00 +0100
parents f26d63dbb22b
children d51894e48762
comparison
equal deleted inserted replaced
365:ba9463b43709 366:80b2e476c2e3
139 \end{center} 139 \end{center}
140 \caption{Using \name{stunnel} for incoming connections} 140 \caption{Using \name{stunnel} for incoming connections}
141 \label{fig:stunnel} 141 \label{fig:stunnel}
142 \end{figure} 142 \end{figure}
143 143
144 To provide encrypted incoming channels, the \MTA\ could implement encryption and listen on a port that is dedicated to encrypted \SMTP\ (\NAME{SMTPS}). This approach would be possible, but it is deprecated in favor for \NAME{STARTTLS}. \RFC3207 ``\SMTP\ Service Extension for Secure \SMTP\ over Transport Layer Security'' shows this by not mentioning \NAME{SMTPS} on port 465. Also port 465 is not even reserved for \NAME{SMTPS} anymore \citeweb{iana:port-numbers}. 144 To provide encrypted incoming channels, the \MTA\ could implement encryption and listen on a port that is dedicated to encrypted \SMTP\ (\NAME{SMTPS}). This approach would be possible, but it is deprecated in favor for \NAME{STARTTLS}. \RFC\,3207 ``\SMTP\ Service Extension for Secure \SMTP\ over Transport Layer Security'' shows this by not mentioning \NAME{SMTPS} on port 465. Also port 465 is not even reserved for \NAME{SMTPS} anymore \citeweb{iana:port-numbers}.
145 145
146 \NAME{STARTTLS}---defined in \RFC2487---is what \RFC3207 recommends to use for secure \SMTP. The connection then goes over port 25 (or the submission port 587), but gets encrypted as the \NAME{STARTTLS} keyword is issued. Email depends on compatibility---only encryption methods that client and server support can be used. Hence it is best to act after the recommendations of the \RFC\ documents. This means \NAME{STARTTLS} encryption should be supported for incoming and for outgoing connections. 146 \NAME{STARTTLS}---defined in \RFC\,2487---is what \RFC\,3207 recommends to use for secure \SMTP. The connection then goes over port 25 (or the submission port 587), but gets encrypted as the \NAME{STARTTLS} keyword is issued. Email depends on compatibility---only encryption methods that client and server support can be used. Hence it is best to act after the recommendations of the \RFC\ documents. This means \NAME{STARTTLS} encryption should be supported for incoming and for outgoing connections.
147 147
148 148
149 149
150 \paragraph{\RF8: Spam handling} 150 \paragraph{\RF8: Spam handling}
151 \label{rf8} 151 \label{rf8}