Yes, you can include an unsubscribe link by enabling the Unsubscribe Link option in your campaign settings.
However, we don’t recommend using it because:
It forces your emails to be sent as HTML, which can affect deliverability
You’ll need to use custom tracking domains to reduce the risk
Instead, we highly suggest adding a plain-text opt-out line in your message.
For example: “If you’re not interested, just reply ‘no’ and I’ll remove you from the list.”