You can use the unsubscribe form to allow the email recipients to opt out from your next follow-up and avoid Anti-SPAM complaints. Follow these three steps to setup the form:

Step 1 - Provide the Return URL and generate the HTML code for the form.
Step 2 - Use the HTML code to publish the form in the web page.
Step 3 - Provide the web page (where the unsubscribe form is published) as a link in the email template.

Note: The HTML code cannot be embedded directly in your email template.

Related Link
Set up Unsubscribe Form