What happens when a subscriber Master Unsubscribes?

When a subscriber Master Unsubscribes, their status is set to "Unsubscribed" on all lists as well as the master list. This means that the action is comprehensive; it ensures that the subscriber cannot receive emails from any lists within the account. A Master Unsubscribe is an important feature within email marketing strategies as it allows for the management of subscriber preferences across the entire system, rather than on a list-by-list basis. This helps maintain compliance with email marketing regulations and protects the sender's reputation by respecting a subscriber's preference to opt-out from all communications.

The other choices either limit the scope of the unsubscribe action to specific lists or imply a different outcome that does not reflect the comprehensive nature of a Master Unsubscribe. In contrast, being set to "Unsubscribed" on every list ensures that the subscriber’s wishes are honored thoroughly across the email service provider's platforms.