All the emails in the world don't prove a thing until they find gear.
Think about this guys.
You walk up to a cop on the corner and say, "I have a huge bag of cocaine at my house." The cop will either think you're a loon and tell you to away, or he'll arrest you and go get a warrant to search your house. Say he gets a warrant and searches your house and finds nothing. What charges could they possibly file? Pretending to possess coke? lol
But this of course is rediculous because rappers say they have killed people, dealy drugs, pimped hoes, stolen cars, etc. in their songs all the time and you don't see the feds running to arrest them for saying things like that do you?
I think that at best, they could try to give you an "attempting to purchase anabolic steroids" charge if all they could find was emails. And even then, they would have to prove that YOU wrote the emails, which is impossible.