My emails (to an earthlink address I have used for 15 years) were not bouncing or ending up in Spam. I have spam protection on earthlink's side turned off, as a matter of fact. They were forwarding to my main address and everything worked perfectly until a week or two ago.
Switching to a gmail address fixed the problem, for now, but I am reasonably sure it's not a 'spam' problem unless my provider just blocked you out altogether. They still allow lots of regular porn/nigerian/pharmacy spam through! :) :)