StevenB you maybe right but email is growing daily.

You need to look at your content. Offer people good information and don't make it a sales letter.

Give before you want. Build the relationship first.

One that is built specifically for Real Estate is QuickeBlast.com
by Quickspace

I use a free product called Groupmail 5 (http://www.group-mail.com/asp/common/default.asp) which is easy to use, but does not provide as many list management options as their retail version.

I discourage bulk email, unless you have a true opt in list.

With that being said, I bet you dollars to doughnuts, your webhost has a mailing list feature on their mail server. Simply upload your email addy's and send one email to the list. The mail server takes care of the rest.

Fast, free and you won't get blacklisted. Problem solved.