How to insert unsubscribe link in Mail Merge Campaign?

Currently, recipients don't have the option to unsubscribe/opt-out as of now. As SalesHandy is not a tool for mass mailing where you send emails to unknown people and require unsubscribe option for the recipient to opt-out.

What you can do is you can create Google form and copy that form link to the end of your Campaign to know how many recipients want to unsubscribe.