I know this is an old thread, but I'm sure people are still interested and I have something to add. There is a great free auto-responder / bulk mailer available online. It works similar to Aweber, but on your server and it's free. There are some videos to help you install it. The little guy that narrates is pretty funny too. It works very well. Here's the URL: http://free-software-download.us/blog/?page_id=11 By the way, I have no association with that little guy (I think it's the guy from the movie The Hangover). I have just used his software in the past.