On Sun, 9 Mar 2003, Marco Paganini wrote:
But it is an indication that the sender was not available or willing to
confirm delivery of his message. This suggests (in my view) enough evidence
to queue the message for later inspection. I believe (from my experience with
a challenge-based authentication tool over these years) that someone who goes
through the trouble of composing a message will also be willing to reply to a
one-time challenge.
On the contrary. If I've spent the time to compose an email to someone the
last thing I want is a bounce back of *any* sort - be it a vacation
message, an answering machine, or a challenge system.
The infuriate me, and I never respond to them.
Also witness the SpamArrest situation. I bet that we'll see less and less
people responding to challenge systems because they fear they will be
spammed at some point in the future by the company running the system.
Matt.
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