Perhaps I am confused. I was under the impression that the dedicated.stonecabin.net in the recieved may cause email from my accounts to be viewed as spam. If this is not the case, then I apologize for wasting everyone's time.
If you take at look at the Received: headers of a random selection of emails you've received from other people, you'll see lots of similar things (i.e. server names in different domains than the email addresses). I wouldn't worry about it.
Paul.