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Message: [QUOTE="Christian Bau, post: 1679132"] I don't know how they do it, but the idea is that I can use ADSL only from my home phone. And if you live next door, use ADSL with another ISP, and we swap computers, then we both won't be able to connect. Yes, the phone number is used only for billing. But that makes it possible to identify me. You know, the solution to this problem is simple. It is so incredibly simple, you won't believe it. If you try to accept only connections from your paying customers, then as a result only very few non-customers will try to connect. So if your authentication server is down, instead of refusing the 99.9% of connection attempts that come from your customers, you accept connections from everyone while that server is down. It is not "worms in general" that cause the problem. It is specific ones. And they are quite easy to identify. That is exactly why I said the ISP should identify email coming from their own customers. As I said, if email is sent from _my_ machine to _my_ ISP then the information to identify the sending machine is 100 percent there. Maybe the infrastructure is not there (but it seems to be there, because some ISPs are doing this already). The worm problem will get worse over the next years, and some kine of action will have to be taken. Maybe taking action costs money, but in the end it will be cheaper than buying more servers. [/QUOTE]