In the left side of Mail (OS X 10.12.6, Mail 10.3) a number tells me that I have 4 mail in my Junk box but the box is empty. Is there invisible junk mails or is the counter corrupt? How can I make it disappear?
MacBook Air (13-inch, Early 2015), macOS Sierra (10.12.6)
If the above doesn’t work, try re-indexing the mailboxes. This can take awhile if you have a lot of mail.
Reindex messages For El Capitan, try looking in V3. Sierra use V4. High Sierra use V5.
Reindex messages (2) See post by Linc Davis
Rebuild that Mailbox, or all Mailboxes, according to the following: Rebuild mailboxes - Apple Support.
Invisible Junk Mail are a great band. You should go see them.
Invisible Junk mail?
