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7.13.5   Why does the Spam mailbox in Apple Mail appear empty even though there’s a number beside it?

Mail shows a number next to the Junk mailbox to indicate how many unread messages it contains. Sometimes you’ll see the number, but when you click on the mailbox to see its contents you’ll see either no messages or no unread messages. This may be because:

  1. The unread messages are actually in a second mailbox, inside the Junk mailbox. If there’s a triangle to the left of the mailbox icon, click to make it point down. This will reveal any mailboxes inside and allow you to access their contents.
  2. Mail’s database is damaged so that the numeric display is out of sync with the actual mail that’s stored on your Mac and/or your server. You can fix this by rebuilding Apple Mail’s database.
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