The newsletter block allows your visitors to send their emails on your website, allowing you to be able to inform them of your business by email. You will find more informations on this page: https://www.en.sitew.com/Block/newsletter-block
This feature is available for all Pro websites.
The pro package also offers:
You will find the detail of the provided services on this page: http://www.sitew.com/Website-creation-packages
To upgrade your website to Premium or Pro package, you can click on this link: Upgrade
You can also test for free and without commitment the Premium and Pro websites and the advanced blocks for 15 days. To test, make a new website from the page My websites.FAQ > Newsletter