I agree that Ben's response is excellent, but I want to focus on the other half of the interaction for a second. Ben needed to send that email because Paul wrote something ridiculous. As Ben gently pointed out, Paul did not actually know what MailChimp (and, presumably, ExactTarget) are doing lately. From the post, it sounds like he fielded a pitch call and basically published what he heard. Sadly that does not seem unusual on tech blogs these days, although I'm surprised Paul fell prey to it.