You may not agree with his sitemail, but I don't see the reason to post it here for "our pleasure". He wasn't threatening you, trying to collude for players, or intimidating you with talk of how much money he had for recruits. I assume he didn't continue after the player, seeing how you are D2 and he's D3.
From my point of view, maybe he touched a nerve. Like has been mentioned, you don't like building your own program. That's your choice. There must be some reason you jump from team to team. Maybe it's because you don't know how to recruit long term? Maybe he's right that you're aiming too low. I might be ticked off too. I may not sitemail you, but could understand the frustration.
As much as you think it's wrong that he sent that message to you, I feel it's bush league for you to post it here. Especially since he didn't break any rules.
Stay Classy