How Does Editing Client Email Address affect emails already sent through CRM

How Does Editing Client Email Address affect emails already sent through CRM

We have some emails that were sent through our CRM to a client with an attached quote. I've now discovered that the employee didn't create the contact with the correct CRM so he wouldn't have received them. To magnify the challenge - another staff member accidently CC'd this client in on an email that wasn't meant for them. IF I correct the email address for this contact will that make the emails already sent available to him?? I would think not but as it was incorrectly entered I don't want to change it and then find out that somehow he can see the email he wasn't supposed to get.

Dopes anyone have any idea about this???