Updates occur when a system administrator manipulates data within Marketing Cloud Engagement, either directly or indirectly.
Direct Editing: An administrator manually changes the status in the "All Subscribers" list UI by opening a subscriber's properties
Data Import: An administrator imports a subscriber list (e.g., from a CRM or external database) using the Import Wizard or Import Activity and overwrites the existing "HTML Enabled" attribute values.
API Updates: If your system is integrated with an external membership or web form system via API, the "HTML enabled" status can be updated in Marketing Cloud Engagement when a change is triggered on the external system's side.
* For reference, see Subscriber and set the EmailTypePreference attribute to HTML.
Updates occur when a subscriber explicitly changes their receive settings via the link typically found in email footers.
Profile Center Changes: If a subscriber accesses the standard Profile Center or a custom preference page, selects their preference for HTML or Text emails, and saves the settings, the status will be updated in the system.
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