Shipping on Product Hunt is an awesome way to create an early access landing page to draw in sign ups. Best part is that if you have an existing list of sign ups you can upload it there to display as social proof.
From here you can schedule in email campaigns to you entire list. It delivers the email from a Product Hunt domain email. Also you can filter you list to Product Hunt users and Makers which is great for better targeting.
So far we've delivered 2 email newsletters about Blitzit to 2000+ Product Hunt users with a successful 10% open rate!