So we build in a system that makes it easy to stop a person from received more emails from you simply head to https://app.salestools.io/prospects search the person and click on their name.
Negative reply (Do not contact)
When someone says do not contact me again simply hit Negative Reply and we stop reaching them again and they go to Do Not Contact list.
Positive Reply (Opportunity)
When pressing positive reply we stop sending more message etc and automatically sync the person to the CRM you have set as default under integrations.