MailinglistMaster.com
They produce StealthMail Master 5.0, rateware.
"The anonymous bulk email software you need to protect your connection from being shut down when you send out bulk email. With this new technology your ISP will not have a problem with your bulk e-mail operation. It uses special proxies for anonymity. Reliable proxy service comes with the software. Proxies are updated daily. We update our proxies several times a day. The program gets its speed from up to 300 concurrent connections to different proxy servers. We carefully select the proxies we add to our database.Instant and very accurate delivery rate is assessed by the program. This is the most reliable proxy mailer out there. It is sold on a membership basis. You can purchase either a monthly or a lifetime membership."
--Chris