Appropriating reputation

One of the thing savvy spammers are doing these days is appropriating the reputation of someone else. Reputation appropriate takes many forms. Some spammers hijack windows machines, turn them into bots and send spam through major ISP smarthosts. “Legitimate email marketers” buy service from mainstream ESPs to send their permission-challenged email that they cannot get delivered through their own IP space.
There are different strategies for companies to prevent bad groups from appropriating their  reputation. For the ESP, the prime defense against reputation appropriation is screening new customers and new lists.
When screening potential customers, there are three broad categories that customers fall into. One is the legit prospect that is exactly whom they represent to you, these are the easy guys. Another is the naive mailer, who really does not have any clue about email but wants to move into the digital age. This mailer is often extremely small, but knows nothing about email. The final category is the subversive prospect. This is the company who knows exactly what they are doing, and who is actively working to hide their practices from the ESP. They are attempting to subvert the process.
Over the coming weeks I will be talking more about screening new customers and how to distinguish the naive customer from the subversive one.