Adding recipients

To – You must have at least one recipient in the email. If you have selected a Contact, Lead, or Opportunity, this field will automatically be populated with that contact's email address. It will not automatically be filled out when you have selected an account or a case. The search buttons to the right of all three address boxes give you access to your Salesforce contacts.
Cc – Carbon Copy Recipients: enter email address(es) as a CC. All To and CC Recipients will be visible to everyone who sees the email, or you may leave this field empty.
Bcc – Blind Carbon Copy Recipients: enter email address(es) as a BCC. All To and CC Recipients will be visible to all recipients, while any BCC recipients will not be displayed. You may add your own email address here if you would like to get a copy of the MFT Email, or you may leave this field empty.