In order to meet the requirements of anti-spam legislation, you must include an unsubscribe link as part of your email content. If an unsubscribe link is not included, you will not be able to schedule your campaign.
By default, all of our templates already include an unsubscribe link - so you shouldn't have to worry about not complying with anti-spam laws.
If you create and upload a template that does not contain an unsubscribe link, one will be added by the system in your campaign's footer.