[tschumacher]

Maybe the big webmail providers are relying more on machine learning for filtering spam instead of blocking IP ranges these days.

[gumballindie]

That would be horribly unreliable. I hope they dont rely on machine learning for such critical infrastructure.

[mort96]

Blocking IP ranges is also horribly unreliable. There is no good way to fight spam in a system like e-mail, just varying levels of terrible ways.