Spammers, the scum that scum scrapes off scum’s shoe, are adopting new tactics. In an effort to make more money botnet operators are switching to a low and slow method. By doing this they hope to avoid detection by the basement dwelling albino set of the RBL operators. You might surmise that this will lead to a lower rate of spam dropping into your inbox. No dice, here’s an example of why.
“one huge botnet, responsible for issuing 50m identical spam emails per day, compromises at least 150,000 distinct IP addresses”
Users of the compromised machines may not notice the spam being sent out as a result. Be diligent in patching your systems and ensure that your antivirus product of choice is running/uptodate.