On 6-jul-2007, at 20:53, Douglas Otis wrote:
How will SMTP servers vet sources of inbound messages within an
IPv6 environment? Virtually every grain of sand can obtain a "new"
IPv6 address.
Simple: look at prefixes rather than individual addresses. If
2002::2002 is a spammer, then you may want to assume that 2002::2003,
2002::2004 etc are also spammers. With IPv6, the "CIDR distance"
between nodes under different administration should be considerably
larger than with IPv4, where you'll often see systems belonging to
different people on consecutive addresses.
An IPv6 address may traverse any number of translation points as well.
Huh? What are you talking about?
This complex topology spells the end of SMTP in its current form.
And that's a bad thing? It's the fundamental lack of, well,
everything, in SMTP that allows all this spam that we're suffering
from these days and makes it impossible to get rid of things like the
base64 encoding overhead.
Build a better mousetrap rather than complain that the mice don't
like the cheese.
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