"If you are invited to the real Game Testing Program, you will receive an e-mail with instructions from firstname.lastname@example.org. Any other e-mail address claiming to offer an invitation is likely to be a scam. If you receive an e-mail and are in doubt or are concerned about its validity, please forward your concerns to email@example.com. If you do receive a genuine testing invitation from us, you will also be able to view the invitation and testing information at www.swtor.com/tester."
BioWare assures us that severe action is being taking against the people who are attempting to sell accounts with access to testing servers. According to the statement, the team is quick to notice when an account changes hands. Be sure to visit the official site for more information.