Issue Description
You are building a new email template/editing an email, utilizing the system token for the unsubscribe link, and are wondering about the expected behavior of the token.
Issue Resolution
The system token unsubscribe link, below, will always behave the same way, and it cannot be customized.
{{system.unsubscribeLink}}
The {{system.unsubscribeLink}} will always bring you to: sub.domain/UnsubscribePage.html.
If your Landing Pages are not branded, this system token will still behave the same way and take the lead to your out-of-the-box Marketo Unsubscribe Page (ending in /UnsubscribePage.html).
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