Is the email address in the database?
Are you sure the smtp mail server settings are correct?
Maybe try updating the line:
$WA_MailObject = WA_SecurityAssist_Definition("smtpout.secureserver.net","25","info@rethinknow.net","","","");
to:
WA_SecurityAssist_Definition("","","info@rethinknow.net","","","");
Most php servers are set up so that the mail server works when left blank.