When a subscriber is sent an email from a sendable data extension, what happens to their email address?

When a subscriber is sent an email from a sendable data extension, their email address is automatically added to the All Subscribers list. This process is a key feature of Salesforce Marketing Cloud, ensuring that any subscriber who is engaged through a sendable data extension becomes part of the central subscriber management view. The All Subscribers list acts as a master list of email addresses along with their subscription status, preferences, and other essential details pertinent to email communication.

By incorporating the email address into the All Subscribers list, the system allows for better management of subscriber records, automated unsubscribe processes, and a streamlined approach to tracking subscriber engagement over time. This automatic addition simplifies the task of managing subscribers, as their interaction with marketing emails effectively creates a record and facilitates ongoing communication within the ecosystem.