In your Grow CRM account, you have the option to enable Do Not Disturb (DND) functions. Basically, this will not opt someone out of all communications, it will only opt them out of marketing type bulk emails, or messaging; messaging you send to a large group. DND wont stop 1:1 communications.

To setup DND, here's what you can do:

NOTE: You can also create a DND Global opt out workflow that will ensure someone can easily opt out of any email or messaging themselves: http://help.pushpress.com/en/articles/5808351-grow-global-opt-out-dnd-compliance