Use a protocol designed for what you want to do (Score 1)

It's amazing how we try solve solve problems like these. Instead of looking at protocols designed pre-spam and before massive automated attacks as being the problem, we see the attacks as the problem. If we continue to latch on to poorly authenticated, plain-text protocols, we'll continue to face these attacks. The solution is to rewrite email, ftp and other insecure and inadequate protocols to meet the modern age. If we continue to 'duct tape' our solutions, spammers and hackers will continue to outpace our development.