In Filters that Fight Back,

[threeringedmoon]

Originally published at Five Acres with a View. You can comment here or there.

In Filters that Fight Back, Paul Graham suggests

One intriguing idea is to literally fight back: to make filters disable spammers’ servers by automatically following all the links in each incoming email. We may be driven to this in order to achieve accurate filtering anyway. Why wait?

And the battle continues.