Look up the CANN Spam act before you do anything.... At $10,000 a letter you better make sure you know what you are doing.
Try this one > http://www.download.com/MailBoy-2004-Free-Edition/3000-2367_4-10601721.html?tag=lst-0-1 they say its popular.
I am looking for a bulk mail software that can send thousand of recipients and we can make an email template.