If all networks had (a) administrators and (b) these admins s cared about spam/viruses, they would have taken the several easy steps required to ensure such unwanted traffic did not originate from (or relay through) their networks. Ditto for your friends.
Large ISP prefere to cure than to preserve...
When you provide network access to more than 10000 computers, it's less time consuming to alert someone that he is infected than to educate every people on the good way to use Internet and to be preserved from infections and attacks.
Unless your friends/associates are sending from fixed IPs, identifying an infected email sent from them is next to impossible.
In fact "If" Headers could be trusted, having IP + Date + Msg Id is sufficient to identify a unique gateway. I say gateway as there might be several users behind a device which do natting.
Anyway
I've got the point, I'll try to see if I get good succes in my fight against spam and virus :) (I'm idealist ;-))
Bye and thanks for all the point of views.
Jerome
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