Welcome to WebmasterWorld Guest from 188.8.131.52
Of course, this may just be a coincidence that I received the same type of email in the last few hours.
My guess: Now that you opened the email, IF it is spam itself, you will now find your inbox filled with offers of cheap colo, cheap servers, cheap . . .
It's the next viagra no doubt, now that they're arresting online pharmacy operatives again.
Also, you should probably request a sample copy of one of the spams with full headers so you can verify it came from your server.