When you want to type a term in the Search field, you have the option of selecting a person or a subject or choose a category. But now that the mail system for indexing is much separate from searching the message contents, you could fail in finding the contents of the message that is matched during the search. Apple Mail uses a different set of collective approach that is called as the Envelope Index and searches the message headers. So, if you are having trouble finding the message while searching headers, there is a good chance the Envelope Index has some problems.Follow one of the following methods if your Apple Mail search not working.
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