alt Hacker NewsIt's impossible for them to stop if you list your email on there. They could make it harder of course. But if you put your email out there for a human to find, then a script or bot or also find it.
And yes of course they can also stop a specific spammer. But that spammer may pick up another account and email.
The grandparent post wasn't asking for them to do the impossible and stop all spamming, only to take action against the particular user that spammed them.