Do I have full control of the branding of emails?
Yes, from a branding perspective, you have full control over the contents of the email, in terms of the logo, color scheme, CSS, and content.
Here's an example email:
In terms of modifying the HTML content, you don't have full control over the HTML itself but there is a base template that can be customized.
If you'd like to get a feel for what your email template will look like, please contact our customer success team. They will be happy to help draft one for you.
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If you'd like to manually modify the CSS for your email, you can do that in Settings > Template > Custom CSS.
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Here's an example of an email template that was customized using Custom CSS: