Opt-in email subscription script?

[Flickstah]

Hi, I'm looking for a new, better version of what I'm using for my free 'zine site.

Right now I use vSignup, it's php and allows a member to submit their name, email and a username/password combo to use to access the site. It then emails the user a confirmation link and that activates their account.

The problem is it won't let me email the users that are signed up.

I need a script that will work the same way vSignup works, but allow me to send out bulk marketing emails.

I ran accross a script like this a while back but am completely unable to find it again. If you know of a free or inexpensive (generally) php/mysql script that will do what I need, I'd really appreciate a link to the site offering it.

Thanks a ton for anyone who can help me out.