> "You agree to register with Sizem and receive the Sizem newsletter."
This sounds ominous; what sort of email have you received? Annoying, spammy, buy-our-stuff stuff, or actually useful?
I can't address the email issue directly. But I know the person behind the product. She's always struck me as sincere. If there was an issue with email I believe she'd be responsive.
You get an email with the sizes the calculator calculated for future reference when they are needed and once the product launches you will be notified. We probably worded it bad, we're not native speakers :) But we're not going to spam folks.