Even free members can use the Random Mailer with either rewarded or purchased mailing credits.

Here is a video that described the different ways all members can get mailing credits rewards... http://viralurl.com/get-rewarded3.php

As a free member, you can win Guaranteed Visitors by visiting links in [iVU] marked emails that arrive at your email address or that you can view in theMessage Center at: http://viralurl.com/message-center3.php

If you are Credit Mailer upgraded, you can in addition earn mailing credits that way.

Is there anything else we can help you with?