Hmm. Not really. I run greylisting on my personal domain which is extremely low traffic and lately I'm getting like 4-5 spams per day that obey it correctly. W

Hmm. Not really. I run greylisting on my personal domain which is extremely low traffic and lately I'm getting like 4-5 spams per day that obey it correctly. Which is more than the non spam emails that come on it :)