nanog mailing list archives

Re: short Botnet list and Cashing in on DoS


From: Mark Andrews <Mark_Andrews () isc org>
Date: Sun, 10 Oct 2004 17:24:52 +1000 (EST)


In article <416833A2.9030503 () linuxbox org> you write:

Next you'll block SIP if we start getting "spam calls"? Or any other 
application that pops up and is used by the same people sending spam today?

There is the issue of usability. Why does a Cable user on a dynamic 
range need SMTP open?

        Cable modem users don't need the IPS's servers for outgoing
        email.  They have the "always on" connection needed to
        reliably deliver email.  The only reason email went via
        ISP's servers back in the dialup days was to get reliable
        delivery.

        In the US there is even more insentive to bypass the ISP's
        servers.  Look are the way they have interpreted the wire
        tap laws.

        Sane end users would also be configuring there systems to
        detect interception of email.  Crypto was added to SMTP
        for a reason.  ISP's shouldn't be getting in the way of
        using it.

        Mark


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