[Mailman-Users] spam, spamcop and mailman moderation
brad at shub-internet.org
Sat Nov 11 04:08:56 CET 2006
At 10:23 AM +0900 11/11/06, stephen at xemacs.org wrote:
> The second is that for a bounded cost, you can implement signed mail.
For dozens of years, we've been telling people that once they have
enough RAM and fast enough disk drives, the single biggest bottleneck
in scaling up large mail systems is the filesystem, and overhead with
regards to sychronous meta-data updates.
Signed mail causes the CPU of the mail server to have to do expensive
crypto calculations that are many, many orders of magnitude beyond
anything that had ever been done in the past, on a per-message basis.
With signed mail, no amount of RAM, or fast disk drives, or smart
filesystems will save you.
You need high-speed crypto accelerators for web servers, because of
all those encrypted SSL connections which are used for secure
transactions. And yet, those are still just the tiniest fraction of
all web connections. What happens when SSL is the default? And
that's on a per-connection basis, where each connection might be able
to represent hundreds or thousands or millions of individual
transactions/messages. What happens when you have to do that level
of crypto calculations on a per-message basis?
At that point, you might as well just shut down all Internet e-mail anyway.
> With current technology this is something of a cost, but for spammers
> it's pure cost, for the rest of us it's arguably a fringe benefit much
> of the time. This is much more effective where usable, because the
> signature identifies the sender to some degree, which spammers do not
Actually, spammers have totally unlimited CPU power available to
them, so they might be the only ones on the planet who are able to
handle doing signed e-mail for all messages.
It doesn't matter that the signed message is actually traceable back
to a particular person, it just matters that it's signed.
Brad Knowles, <brad at shub-internet.org>
Trend Micro has announced that they will cancel the stop.mail-abuse.org
mail forwarding service as of 15 November 2006. If you have an old
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