I have a MacBook pro running macOS Sierra.
All of a sudden the Apple Mail program started filtering messages. I know that they are there in my inbox but I can't see them. When new mail comes, it's there for a bit but then disappears from view. I know it's there because I can search for it and find it.
How can I turn off this filtering???
I don't use gmail, just the Apple program with our local email provider. I have restored macOS and rebuilt the inbox several times. At one point I saw there were multiple copies of the same emails from the day this problem started.