The Magic Email
winwithoutpitching.com
winwithoutpitching.com
Saying things like "I just wanted to see how you're handling X" and then going into the sales spiel, or "I wanted to circle back around Y" and so on.
I'm assuming this is more effective than the previous methods or they wouldn't be using it, but I find it even more off-putting.
Precise with some potion of rudeness :) "Subject: Closing The Loop"