Where should I place the unsubscribe button? Is it mandatory to give this option?
Many organizations provide an unsubscribe option at the end of an email, or they offer an option to go to a preference center that allows subscribers to alter their subscription choices. Most email service providers make these linking options available in their email builder.
Every marketing email you send must give the person the ability to opt out of (or ‘unsubscribe from’) further emails. You must tell customers if you add them to a list of people who do not want to be emailed.
Most email marketing providers are stricter than the law and don’t allow sending emails unless people have explicitly opted in. You must have your mailing address and a way to unsubscribe.