Newsletter feature

I’ve been searching and searching for a simple newsletter script that will only allow certain emails to register. If the email is not listed then it will deny and give an error. I’m not sure if there’s any newsletter with that feature. Do you guys know of any?

What I need it for is because I design iPhone themes and sell them. However I have updates for each theme but instead of sending the update to everyone who already bought the theme, I would like to have the option where if he/she wants the update then he/she can subscribe and I’ll send it to them. Though, I only want those who already bought the theme to be able to subscribe…Too complicated? :frowning:

Also, it doesn’t have to be a newsletter with all the other features…Something that will do just that.

Thanks in advance!

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