On Mon, 30 Apr 2001, Tom Neff wrote:
> As a matter of
> practice, if you check your sender's relay and you impose a limit (hard,
> agreed-upon or otherwise) on the number of recipients within your domain,
> you can let real lists through while blocking spam campaigns, or so it
> would seem to me.
Hmmm... So let's see, you impose a hard limit, Joe Spammer comes along
and runs the table until he hits your limit. Your systems says "Hey,
Spammer!" and shuts him down, but the damage has already been done.
Joe's system then switches IPs and continues where it left off.
And don't say they aren't that sophisticated. I saw just this behavior
a few years ago with an open relay that was trying to get by with a
similar system to keep the spammers out.
-Mitch
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