How do people unsubscribe from emails sent automatically

When setting up a form, emails can be then be automatically sent to people that fill in the form. If they then decide to unsubscribe from these email is there a mechanism for them to do so, ie adding an unsubscribe link, or if they contact the forms creator can they stop the automatic emails on the user's behalf ?

The Autoresponder Email by itself does not have function to 'unsubscribe'. Because it doesn't actually have subscription feature like what an Emailing integrations does.

A workaround you can do if you want the user to not able receive email after submitting the form is to use Conditions in email.

Your form is the one triggering emails to them, so if you want them to choose whether they want to receive an Autoresponder after submitting the form, just add a Single Choice field with a YES/NO option, then use Conditions to conditionally send them an Autoresponder Email if they choose YES.

Complete guide: How-to-Send-Email-Based-on-User-s-Answer 

Let us know if this will not work.