Originally posted by aldo_14
but what spammer would install filtering software at their end?
None. But the idea is a filter on the ISP level, not the end user level. If the ISPs block the spamm comming out, they keep it from reaching the rest of the web.
The largest offenders have their equipment taken and a heavy fine - should that not prove enough a prison sentence.
No need, and not viable.
All you need to do is have the ISPs drop their contract for connection. Simple. If you spamm, you´re out. Some might say the ISPs want to make money, so there´s no way they would drop a contract, but if we think about it this would be in their best interest aswell, as their servers don´t have to deal with so much crap.