MailBoy 2004 MASS MAILER - Easy to use yet powerful mass mailer. Built-in SMTP, built-in DNS, fast import and export of email addresses, ability to remove fast the duplicate addresses, 300 sending threads, ability to change the identity of the mailer, organize senders accounts and mail lists, unsubscribers list and much more. Also if you need an additional program's feature , you have the opportunity to ask the development team to add it in the next version.