I have three email accounts in Mac mail. Two of them I use anonymously at times but I have just discovered from return emails that my full name is associated with the email address. The person at the other end can see who I am. I have googled for help and old posts talk about how to change it by going into preferences, find your account and the "full name" box. Apparently in Sierra there is no such box. I am not happy as it is private information I do not wish to always disclose. Is there a way of changing or deleting my name from the email addresses I use?