out of curiosity — since it sounds like you might have been working on promotional or unsolicited email — did you ever see responses from your emails?
i’ve been responding to marketing emails recently — often CC’ing generic accounts like marketing@company, help@company, etc to try to reach actual humans in the loop. the process has been fascinating to me and the number of (intentional or unintentional) choke-points makes me wonder if — even in the more enlightened organizations i’ve worked in — i could ever stand a chance of understanding our email campaigns, inside and out.