Before you post, I already searched and hundreds of posts popped up. I could not find any that addressed my issue. First, this is my first Apple product having been a Windows user for many years. I bought a new MacBook Pro a month ago. I added two mailboxes - Gmail and an MCHSI (Mediacom) mailbox. Now I have all my mchsi Emails being redirected to my Gmail Email account. I cannot delete the mchsi mailbox account. I've already done the delete Mailbox account multiple times. I've deleted all Emails in the mchsi folders. I've searched the Internet. I cannot locate Mail - Preferences etc. Help?