123 Hidden Sender sends absolute ANONYMOUS bulk emails. You won't lose your ISP service. It is trouble free! Your IP address will not be shown in the email headers! All you do is input your message, subject, and email addresses, and then 123 Hidden Sender does all the rest. No relays to deal with anymore. No need for expensive bulk ISPs. Port 25 is not a problem. 123 Hidden Sender supports sending personalized messages (dynamic 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. This feature is implemented by CSV file import and Randomization Tags and Personalizing Tags.