Reply #9: Its not DOS, and blocking unwanted content has been legal for some time.

[ProgressiveProfessor]

Nothing says the email has to go through. ISPs, and bandwidth providers have options to not allow traffic from certain IP addresses/ranges today. Unless care it taken net neutrality would disallow that kind of self policing that was worked surprisingly well. Look up the Internet Death Penalty and Usenet Death Penalty. The better answer is to craft legislation that allows the good part of private network ownership to continue while not allowing the downside to thrive as well.