What is the difference between these two buttons to cc$?$ There is no difference. The $2$ field will have the email address of one or more recipients. The email address in the CCS field are added for them to get the information in the email. The $2$ field will have the email address of one or more sapient. The email address in the CCS field will be hidden from everyone else. The $2$ field will have the email address of the only first recipient. The CCS field will have the email address of the next recipient.