You will not be able to make sure that the address exists. Due to the distributed structure of the internet, the knowledge of whether an address exists is not available at one central point.
What you could do is check whether the domain to which the email is sent (cc.com
in your example) exists and therefore if there's a chance of your email arriving. The idea of using the MX record is basically this; you can check which server would be responsible for the delivery of your email.