> but the reputation of your whole /24 block. That seems to be where a lot of filtering based on reputation takes place. That is due to the prevalence of what

> but the reputation of your whole /24 block. That seems to be where a lot of filtering based on reputation takes place. That is due to the prevalence of what is known as Snowshoe Spam. Spammers get old of (or infiltrate) large net blocks and then spread out their spamming across the entire range. The extreme version of Snowshoe Spam is known as Hailstorm Spam. For fairly obvious reasons ... spammers get hold of (or infiltrate) a large netblock, intensively abuse the hell out of it and then move on.