SharePoint Designer 2013 workflows verify workflow email recipients are part of your organization, while SPD 2010 workflows do not.
Yes, you can have a BCC field in your SharePoint Designer workflow emails. I didn’t know this until recently, and was pleasantly surprised. It’s quick and simple, so let’s get started.
Note: You can do this in both 2010 and 2013 SharePoint Designer workflows, using the exact same steps.