e-mail manager

I have just added a form to my site that collects peoples information - Name, addy, telly, e-mail they then approve to receive mailing from me. Now, that I am starting to collect e-mail address I want to be able to send e-mail to all these people (mass-emailing). I want to send it so it looks like it is only going to them (so BCC I think it is called). Are there any free programs out there that can do this or can someone help me in doing this? I am thinking it is something like a CMS.

The address and such are collected in .mdb format
I am running in a windows server environment.

Thanks,
Adiz