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If searching doesn’t find the right messages
There can be several reasons why your searches don’t return the results you expect.
If a specific mailbox is selected in the Favorites bar, Mail searches only that mailbox. To search all mailboxes instead, click All.
Mail may not be looking in the Trash or Junk mailboxes, or searching encrypted messages. To include them when searching all mailboxes, choose Mail > Preferences, click General, then select the options.
You may need to sync the mailboxes on your Mac with those on the mail server. Choose Mailbox > Synchronize > [account].
The Mail folder (located in your home Library folder) may be excluded from Spotlight searching. To check, choose Apple menu > System Preferences, click Spotlight, then click Privacy.