At 11:13 AM -0500 3/5/03, David F. Skoll wrote:
I know an ISP which has blocked over 10,000 IP addresses that have sent test probes against his server. This in a matter of just a few months. As soon as he blocks one, the spammer starts using a different one.It is quite expensive to gather a large set of open relays. If you're sending out 500K messages, and you want to limit it to 1,000 messages/IP, you need to find 500 open relays.