Landing Page to build Shopify List

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Hello, I am a newbie

I'm looking to create a landing page which will add email addresses to my shopify customer list. This sounds simple but I just can't see how to do this. All I want is a page that will add an email address to my subscribed list like it does on the checkout page where it asks a customer if they want to subscribe.

Here is my rough landing page so far 

but this requires a mailchimp account and I don't want to have to maintain 2 lists

If it is not possible to do this myself, is there a third party ap that will do it for me?

Thank you all in advance