Mail for Mac: If messages appear to be missing
If messages seem to be missing from mailboxes, try these suggestions.
If you use more than one email account in Mail, make sure you’re looking at messages for the correct account.
If you sorted messages, they may be in the list but not in the order you expect.
If you use rules, they may have moved messages to other mailboxes. Try searching for the messages.
Quit Mail, then reopen it.
If the problem persists, you may need to rebuild a mailbox.
Last Modified: Sep 22, 2016