The preference center is hosted by braze on emailinboundprocessing.com. In the future we will build support custom domains (i.e. companies can delegate their own domains to Braze)
More context from our Fall Release here:
Uplevel your retention strategy with HTML Preference Center. Audience retention is paramount at the end of the year, and a preference center that matches your brand and caters to your customers’ needs is a key part of any retention strategy. This update opens up the preference center page via a REST API endpoint, which you can use to fully build a flexible, powerful, on-brand preference center.
