In Mac Mail I have several mailboxes and one of them is a smart mailbox. I want to add this as a sub folder in my main Inbox, but keep the smart mailbox to act as a filter. I notice there is no entry for this email account in my accounts window so do I have to enter this mail account in prefs again. It is no real problem where it is now, only that it is not sitting in my inbox. All email is received ok. I am on Mail 5.2.