Silver package used for non-Drupal websites: for more information or to sign up for free 30 day trial go to http://www.e-listmail.com/
Bronze package - used to relay very large volume of email using your favorite desktop email application like Outlook or Mozilla Thunderbird via SMTP servers with good reputation that guarantee you better delivery rate (less bounces and spam filter hits) and no risk of getting your email account blacklisted or suspended for generating too much outgoing email traffic.