Master Sender - Version 3.17 Master Sender sends absolute ANONYMOUS bulk emails. Your IP address will not be shown in the email headers! No need to enter proxy by yourself, Master Sender contains proxy servers.No need to buy SMTP relays. No need for expensive bulk ISPs. It can send mail out from your PC even your ISP blocks port 25 (SMTP Port).Master Sender supports sending merged messages, this is a great feature. It really gets the attention of the recipient to see their name in the subject and in the body of the email.