From: Charles Sprickman (no email)
Date: Mon Dec 01 2003 - 16:00:22 EST
On Mon, 1 Dec 2003, Steven M. Bellovin wrote:
> Right. Assuming that the described validation scheme is, in fact,
> what's being used, you'd expect Verizon's mailer to retain and cache
> the validation. That way, a single 450 can be turned into a 200 series
> or a 550.
Also imagine your domain being joe-jobbed. You, as an innocent bystander,
then get hammered by Verizon as they try to do a lookup on possibly
millions of incoming mails.
It's just not a very sane way to reduce their spamload. It's something
I'd expect from a smaller ISP, but I would have imagined by now that VZ
would have the money to go with something like Brightmail, or develop
something in-house like AOL.
Charles
> As Randy said, 450 means "there's a problem here that should be fixed
> soon; come back later". If it doesn't change, it's not a 450.
>
> --Steve Bellovin, http://www.research.att.com/~smb
>
>
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