RENXT has no email capture form to embed in a website.
It has a marketing email function, but no ability to collect the emails to then direct these marketing emails to.
Of course, there is an email capture form within the donation form, which suits Blackbaud as it requires people to use BBMS, thus generating them income.
But a simple email capture form, like you see on any website, "Please sign up or subscribe to email updates" does not exist.