On 06/02/2010 04:25 PM, Steve Atkins wrote:
On Jun 2, 2010, at 4:10 PM, Michael Thomas wrote:
On 06/02/2010 03:47 PM, Douglas Otis wrote:
On 6/2/10 2:43 PM, Michael Thomas wrote:
Instead of kvetching about ADSP, you might tell the list owners that their
list software heuristics are broken.
Mailing lists are on higher ground, since they are not introducing the
new mechanism.
When we let existing heuristics dictate what we can design on the net, then
we have
failed. Heuristics by their nature are then things that need to deal with
their own
shortcomings. The problem here is not with ADSP. It's bad assumptions made
by heuristics.
The "heuristic" here is that a 5xx ESMTP response means that the
recipient is rejecting email from the sender, I believe. It's not really
an obscure bit of existing practice, rather it's both "best" and "common".
No. The heuristic is "because I got a reject(s) from this subscriber delivering
his list mail, I'm going to kick him". That's a heuristic. It's not working
right.
You could probably get the same bad outcome with a determined attacker not using
ADSP at all.
Mike
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